diff --git a/Documentation/access-control.txt b/Documentation/access-control.txt
index 9a40b27..185fa07 100644
--- a/Documentation/access-control.txt
+++ b/Documentation/access-control.txt
@@ -1370,10 +1370,11 @@
 [[capability_createProject]]
 === Create Project
 
-Allow project creation.  This capability allows the granted group to
-either link:cmd-create-project.html[create new git projects via ssh]
-or via the web UI.
+Allow project creation.
 
+This capability allows the granted group to create projects via the web UI, via
+link:rest-api-projects.html#create-project][REST] and via
+link:cmd-create-project.html[SSH].
 
 [[capability_emailReviewers]]
 === Email Reviewers
diff --git a/Documentation/user-review-ui.txt b/Documentation/user-review-ui.txt
index 73668d7..780d3ec 100644
--- a/Documentation/user-review-ui.txt
+++ b/Documentation/user-review-ui.txt
@@ -88,7 +88,7 @@
 
 image::images/user-review-ui-change-metadata.png[width=600, link="images/user-review-ui-change-metadata.png"]
 
-- [[owner]]Owner/Uploader/Author/Committer
+- [[owner]]Owner/Uploader/Author/Committer:
 +
 Owner is the person who created the change
 +
@@ -170,11 +170,11 @@
 The SHA of the commit corresponding to the merged change on the destination
 branch.
 
-- [[revert-created-as]]Revert (Created|Submitted) As
+- [[revert-created-as]]Revert (Created|Submitted) As:
 +
 Points to the revert change, if one was created.
 
-- [[cherry-pick-of]]Cherry-pick of
+- [[cherry-pick-of]]Cherry-pick of:
 +
 If the change was created as cherry-pick of some other change to a different
 branch, points to the original change.
@@ -207,7 +207,7 @@
 link:config-submit-requirements.html[Submit Requirement Configuration] page.
 
 [[actions]]
-=== Actions:
+=== Actions
 Actions buttons are at the top right and in the overflow menu.
 Depending on the change state and the permissions of the user, different
 actions are available on the change:
diff --git a/Documentation/user-search.txt b/Documentation/user-search.txt
index 565c491..e12c27c 100644
--- a/Documentation/user-search.txt
+++ b/Documentation/user-search.txt
@@ -43,6 +43,17 @@
 For more predictable results, use explicit search operators as described
 in the following section.
 
+[IMPORTANT]
+--
+The change search API is backed by a secondary index and might sometimes return
+stale results if the re-indexing operation failed for a change update.
+
+Please also note that changes are not re-indexed if the project configuration
+is updated with newly added or modified
+link:config-submit-requirements.html[submit requirements].
+--
+
+
 [[search-operators]]
 == Search Operators
 
diff --git a/java/com/google/gerrit/acceptance/testsuite/change/ChangeOperationsImpl.java b/java/com/google/gerrit/acceptance/testsuite/change/ChangeOperationsImpl.java
index c1029be..0966bbe 100644
--- a/java/com/google/gerrit/acceptance/testsuite/change/ChangeOperationsImpl.java
+++ b/java/com/google/gerrit/acceptance/testsuite/change/ChangeOperationsImpl.java
@@ -441,8 +441,10 @@
         PatchSetInserter patchSetInserter =
             getPatchSetInserter(changeNotes, newPatchsetCommit, patchsetId);
 
-        IdentifiedUser changeOwner = userFactory.create(changeNotes.getChange().getOwner());
-        try (BatchUpdate batchUpdate = batchUpdateFactory.create(project, changeOwner, now)) {
+        Account.Id uploaderId =
+            patchsetCreation.uploader().orElse(changeNotes.getChange().getOwner());
+        IdentifiedUser uploader = userFactory.create(uploaderId);
+        try (BatchUpdate batchUpdate = batchUpdateFactory.create(project, uploader, now)) {
           batchUpdate.setRepository(repository, revWalk, objectInserter);
           batchUpdate.addOp(changeId, patchSetInserter);
           batchUpdate.execute();
diff --git a/java/com/google/gerrit/acceptance/testsuite/change/TestPatchsetCreation.java b/java/com/google/gerrit/acceptance/testsuite/change/TestPatchsetCreation.java
index 22a4da6..32731c1 100644
--- a/java/com/google/gerrit/acceptance/testsuite/change/TestPatchsetCreation.java
+++ b/java/com/google/gerrit/acceptance/testsuite/change/TestPatchsetCreation.java
@@ -17,6 +17,7 @@
 import com.google.auto.value.AutoValue;
 import com.google.common.collect.ImmutableList;
 import com.google.gerrit.acceptance.testsuite.ThrowingFunction;
+import com.google.gerrit.entities.Account;
 import com.google.gerrit.entities.PatchSet;
 import com.google.gerrit.server.edit.tree.TreeModification;
 import java.util.Optional;
@@ -25,6 +26,8 @@
 @AutoValue
 public abstract class TestPatchsetCreation {
 
+  public abstract Optional<Account.Id> uploader();
+
   public abstract Optional<String> commitMessage();
 
   public abstract ImmutableList<TreeModification> treeModifications();
@@ -40,6 +43,11 @@
 
   @AutoValue.Builder
   public abstract static class Builder {
+    /**
+     * The uploader for the new patch set. If not set the new patch set is uploaded by the change
+     * owner.
+     */
+    public abstract Builder uploader(Account.Id uploader);
 
     public abstract Builder commitMessage(String commitMessage);
 
diff --git a/java/com/google/gerrit/httpd/raw/StaticModule.java b/java/com/google/gerrit/httpd/raw/StaticModule.java
index 129d961..961bf9b 100644
--- a/java/com/google/gerrit/httpd/raw/StaticModule.java
+++ b/java/com/google/gerrit/httpd/raw/StaticModule.java
@@ -79,7 +79,6 @@
           "/dashboard/*",
           "/groups/self",
           "/settings/*",
-          "/topic/*",
           "/Documentation/q/*");
 
   /**
diff --git a/java/com/google/gerrit/index/Index.java b/java/com/google/gerrit/index/Index.java
index f2aafcf9..870d827 100644
--- a/java/com/google/gerrit/index/Index.java
+++ b/java/com/google/gerrit/index/Index.java
@@ -156,4 +156,14 @@
   default boolean isEnabled() {
     return true;
   }
+
+  /**
+   * Rewriter that should be invoked on queries to this index.
+   *
+   * <p>The default implementation does not do anything. Should be overridden by implementation, if
+   * needed.
+   */
+  default IndexRewriter<V> getIndexRewriter() {
+    return (in, opts) -> in;
+  }
 }
diff --git a/java/com/google/gerrit/index/query/QueryProcessor.java b/java/com/google/gerrit/index/query/QueryProcessor.java
index f237006..1c8bbc3 100644
--- a/java/com/google/gerrit/index/query/QueryProcessor.java
+++ b/java/com/google/gerrit/index/query/QueryProcessor.java
@@ -268,7 +268,9 @@
                 limit,
                 getRequestedFields());
         logger.atFine().log("Query options: %s", opts);
-        Predicate<T> pred = rewriter.rewrite(q, opts);
+        // Apply index-specific rewrite first
+        Predicate<T> pred = indexes.getSearchIndex().getIndexRewriter().rewrite(q, opts);
+        pred = rewriter.rewrite(pred, opts);
         if (enforceVisibility) {
           pred = enforceVisibility(pred);
         }
diff --git a/java/com/google/gerrit/server/IdentifiedUser.java b/java/com/google/gerrit/server/IdentifiedUser.java
index 65a81f7..eda6e09 100644
--- a/java/com/google/gerrit/server/IdentifiedUser.java
+++ b/java/com/google/gerrit/server/IdentifiedUser.java
@@ -100,30 +100,30 @@
           enablePeerIPInReflogRecord,
           Providers.of(null),
           state,
-          null);
+          /* realUser= */ null);
     }
 
     public IdentifiedUser create(Account.Id id) {
-      return create(null, id);
+      return create(/* remotePeer= */ null, id);
     }
 
     @VisibleForTesting
     @UsedAt(UsedAt.Project.GOOGLE)
     public IdentifiedUser forTest(Account.Id id, PropertyMap properties) {
-      return runAs(null, id, null, properties);
+      return runAs(/* remotePeer= */ null, id, /* caller= */ null, properties);
     }
 
-    public IdentifiedUser create(SocketAddress remotePeer, Account.Id id) {
-      return runAs(remotePeer, id, null);
+    public IdentifiedUser create(@Nullable SocketAddress remotePeer, Account.Id id) {
+      return runAs(remotePeer, id, /* caller= */ null);
     }
 
     public IdentifiedUser runAs(
-        SocketAddress remotePeer, Account.Id id, @Nullable CurrentUser caller) {
+        @Nullable SocketAddress remotePeer, Account.Id id, @Nullable CurrentUser caller) {
       return runAs(remotePeer, id, caller, PropertyMap.EMPTY);
     }
 
     private IdentifiedUser runAs(
-        SocketAddress remotePeer,
+        @Nullable SocketAddress remotePeer,
         Account.Id id,
         @Nullable CurrentUser caller,
         PropertyMap properties) {
@@ -244,7 +244,7 @@
       AccountCache accountCache,
       GroupBackend groupBackend,
       Boolean enablePeerIPInReflogRecord,
-      @Nullable Provider<SocketAddress> remotePeerProvider,
+      Provider<SocketAddress> remotePeerProvider,
       AccountState state,
       @Nullable CurrentUser realUser) {
     this(
@@ -270,7 +270,7 @@
       AccountCache accountCache,
       GroupBackend groupBackend,
       Boolean enablePeerIPInReflogRecord,
-      @Nullable Provider<SocketAddress> remotePeerProvider,
+      Provider<SocketAddress> remotePeerProvider,
       Account.Id id,
       @Nullable CurrentUser realUser,
       PropertyMap properties) {
diff --git a/java/com/google/gerrit/server/account/AccountResolver.java b/java/com/google/gerrit/server/account/AccountResolver.java
index 389b292..d2417d7 100644
--- a/java/com/google/gerrit/server/account/AccountResolver.java
+++ b/java/com/google/gerrit/server/account/AccountResolver.java
@@ -211,7 +211,7 @@
         return searchedAsUser.asIdentifiedUser();
       }
       return userFactory.runAs(
-          null, list.get(0).account().id(), requireNonNull(caller).getRealUser());
+          /* remotePeer= */ null, list.get(0).account().id(), requireNonNull(caller).getRealUser());
     }
 
     @VisibleForTesting
@@ -790,7 +790,7 @@
 
     @Override
     public Predicate<AccountState> get() {
-      return accountControlFactory.get(asUser.asIdentifiedUser())::canSee;
+      return accountControlFactory.get(asUser)::canSee;
     }
   }
 
diff --git a/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java b/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java
index 5a4580c..32ec401 100644
--- a/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java
+++ b/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java
@@ -20,14 +20,9 @@
 public class ExperimentFeaturesConstants {
 
   /** Features that are known experiments and can be referenced in the code. */
-  public static String UI_FEATURE_PATCHSET_COMMENTS = "UiFeature__patchset_comments";
-
-  public static String UI_FEATURE_SUBMIT_REQUIREMENTS_UI = "UiFeature__submit_requirements_ui";
-
   public static String GERRIT_BACKEND_FEATURE_ATTACH_NONCE_TO_DOCUMENTATION =
       "GerritBackendFeature__attach_nonce_to_documentation";
 
   /** Features, enabled by default in the current release. */
-  public static final ImmutableSet<String> DEFAULT_ENABLED_FEATURES =
-      ImmutableSet.of(UI_FEATURE_PATCHSET_COMMENTS, UI_FEATURE_SUBMIT_REQUIREMENTS_UI);
+  public static final ImmutableSet<String> DEFAULT_ENABLED_FEATURES = ImmutableSet.of();
 }
diff --git a/java/com/google/gerrit/server/permissions/ChangeControl.java b/java/com/google/gerrit/server/permissions/ChangeControl.java
index 6f7d761..e36ce7b 100644
--- a/java/com/google/gerrit/server/permissions/ChangeControl.java
+++ b/java/com/google/gerrit/server/permissions/ChangeControl.java
@@ -216,7 +216,10 @@
     public void check(ChangePermissionOrLabel perm)
         throws AuthException, PermissionBackendException {
       if (!can(perm)) {
-        throw new AuthException(perm.describeForException() + " not permitted");
+        throw new AuthException(
+            perm.describeForException()
+                + " not permitted"
+                + perm.hintForException().map(hint -> " (" + hint + ")").orElse(""));
       }
     }
 
diff --git a/java/com/google/gerrit/server/permissions/ChangePermission.java b/java/com/google/gerrit/server/permissions/ChangePermission.java
index 63b0378..6ceed3e 100644
--- a/java/com/google/gerrit/server/permissions/ChangePermission.java
+++ b/java/com/google/gerrit/server/permissions/ChangePermission.java
@@ -16,7 +16,9 @@
 
 import static java.util.Objects.requireNonNull;
 
+import com.google.gerrit.common.Nullable;
 import com.google.gerrit.extensions.api.access.GerritPermission;
+import java.util.Optional;
 
 public enum ChangePermission implements ChangePermissionOrLabel {
   READ,
@@ -53,24 +55,40 @@
    * <p>Before checking this permission, the caller should first verify the current patch set of the
    * change is not locked by calling {@code PatchSetUtil.isPatchSetLocked}.
    */
-  REBASE,
+  REBASE(
+      /* description= */ null,
+      /* hint= */ "change owners and users with the 'Submit' or 'Rebase' permission can rebase"
+          + " if they have the 'Push' permission"),
   REVERT,
   SUBMIT,
   SUBMIT_AS("submit on behalf of other users"),
   TOGGLE_WORK_IN_PROGRESS_STATE;
 
   private final String description;
+  private final String hint;
 
   ChangePermission() {
     this.description = null;
+    this.hint = null;
   }
 
   ChangePermission(String description) {
     this.description = requireNonNull(description);
+    this.hint = null;
+  }
+
+  ChangePermission(@Nullable String description, String hint) {
+    this.description = description;
+    this.hint = requireNonNull(hint);
   }
 
   @Override
   public String describeForException() {
     return description != null ? description : GerritPermission.describeEnumValue(this);
   }
+
+  @Override
+  public Optional<String> hintForException() {
+    return Optional.ofNullable(hint);
+  }
 }
diff --git a/java/com/google/gerrit/server/permissions/ChangePermissionOrLabel.java b/java/com/google/gerrit/server/permissions/ChangePermissionOrLabel.java
index f59ba02..9254158 100644
--- a/java/com/google/gerrit/server/permissions/ChangePermissionOrLabel.java
+++ b/java/com/google/gerrit/server/permissions/ChangePermissionOrLabel.java
@@ -15,6 +15,17 @@
 package com.google.gerrit.server.permissions;
 
 import com.google.gerrit.extensions.api.access.GerritPermission;
+import java.util.Optional;
 
 /** A {@link ChangePermission} or a {@link AbstractLabelPermission}. */
-public interface ChangePermissionOrLabel extends GerritPermission {}
+public interface ChangePermissionOrLabel extends GerritPermission {
+  /**
+   * A hint that explains under which conditions this permission is permitted.
+   *
+   * <p>This is useful for permissions that are not directly assigned but are indirectly permitted
+   * by the user having other permissions or being the change owner.
+   */
+  default Optional<String> hintForException() {
+    return Optional.empty();
+  }
+}
diff --git a/java/com/google/gerrit/server/query/change/InternalChangeQuery.java b/java/com/google/gerrit/server/query/change/InternalChangeQuery.java
index ccd645b..3edad69 100644
--- a/java/com/google/gerrit/server/query/change/InternalChangeQuery.java
+++ b/java/com/google/gerrit/server/query/change/InternalChangeQuery.java
@@ -26,6 +26,7 @@
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Sets;
+import com.google.gerrit.common.UsedAt;
 import com.google.gerrit.entities.BranchNameKey;
 import com.google.gerrit.entities.Change;
 import com.google.gerrit.entities.Project;
@@ -103,6 +104,7 @@
     return query(ChangePredicates.idStr(id));
   }
 
+  @UsedAt(UsedAt.Project.GOOGLE)
   public List<ChangeData> byLegacyChangeIds(Collection<Change.Id> ids) {
     List<Predicate<ChangeData>> preds = new ArrayList<>(ids.size());
     for (Change.Id id : ids) {
@@ -115,15 +117,6 @@
     return query(byBranchKeyPred(branch, key));
   }
 
-  public List<ChangeData> byBranchKeyOpen(Project.NameKey project, String branch, Change.Key key) {
-    return query(and(byBranchKeyPred(BranchNameKey.create(project, branch), key), open()));
-  }
-
-  public static Predicate<ChangeData> byBranchKeyOpenPred(
-      Project.NameKey project, String branch, Change.Key key) {
-    return and(byBranchKeyPred(BranchNameKey.create(project, branch), key), open());
-  }
-
   private static Predicate<ChangeData> byBranchKeyPred(BranchNameKey branch, Change.Key key) {
     return and(ref(branch), project(branch.project()), change(key));
   }
diff --git a/java/com/google/gerrit/util/cli/ApiProtocolBufferGenerator.java b/java/com/google/gerrit/util/cli/ApiProtocolBufferGenerator.java
new file mode 100644
index 0000000..27e4b17
--- /dev/null
+++ b/java/com/google/gerrit/util/cli/ApiProtocolBufferGenerator.java
@@ -0,0 +1,176 @@
+// Copyright (C) 2023 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.util.cli;
+
+import com.google.common.base.CaseFormat;
+import com.google.common.reflect.ClassPath;
+import java.lang.reflect.Field;
+import java.lang.reflect.ParameterizedType;
+import java.sql.Timestamp;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+/**
+ * Utility to generate Protocol Buffers (*.proto) files from existing POJO API types.
+ *
+ * <p>Usage:
+ *
+ * <ul>
+ *   <li>Print proto representation of all API objects: {@code bazelisk run
+ *       java/com/google/gerrit/util/cli:protogen}
+ * </ul>
+ */
+public class ApiProtocolBufferGenerator {
+  private static String NOTICE =
+      "// Copyright (C) 2023 The Android Open Source Project\n"
+          + "//\n"
+          + "// Licensed under the Apache License, Version 2.0 (the \"License\");\n"
+          + "// you may not use this file except in compliance with the License.\n"
+          + "// You may obtain a copy of the License at\n"
+          + "//\n"
+          + "// http://www.apache.org/licenses/LICENSE-2.0\n"
+          + "//\n"
+          + "// Unless required by applicable law or agreed to in writing, software\n"
+          + "// distributed under the License is distributed on an \"AS IS\" BASIS,\n"
+          + "// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n"
+          + "// See the License for the specific language governing permissions and\n"
+          + "// limitations under the License.";
+
+  private static String PACKAGE = "com.google.gerrit.extensions.common";
+
+  public static void main(String[] args) {
+    try {
+      ClassPath.from(ClassLoader.getSystemClassLoader()).getAllClasses().stream()
+          .filter(c -> c.getPackageName().equalsIgnoreCase(PACKAGE))
+          .filter(c -> c.getName().endsWith("Input") || c.getName().endsWith("Info"))
+          .map(clazz -> clazz.load())
+          .forEach(ApiProtocolBufferGenerator::exportSingleClass);
+    } catch (Exception e) {
+      System.err.println(e);
+    }
+  }
+
+  private static void exportSingleClass(Class<?> clazz) {
+    StringBuilder proto = new StringBuilder(NOTICE);
+    proto.append("\n\nsyntax = \"proto3\";");
+    proto.append("\n\npackage gerrit.api;");
+    proto.append("\n\noption java_package = \"" + PACKAGE + "\";");
+
+    int fieldNumber = 1;
+
+    proto.append("\n\n\nmessage " + clazz.getSimpleName() + " {\n");
+
+    for (Field f : clazz.getFields()) {
+      Class<?> type = f.getType();
+
+      if (type.isAssignableFrom(List.class)) {
+        ParameterizedType list = (ParameterizedType) f.getGenericType();
+        Class<?> genericType = (Class<?>) list.getActualTypeArguments()[0];
+        String protoType =
+            protoType(genericType)
+                .orElseThrow(() -> new IllegalStateException("unknown type: " + genericType));
+        proto.append(
+            String.format(
+                "repeated %s %s = %d;\n", protoType, protoName(f.getName()), fieldNumber));
+      } else if (type.isAssignableFrom(Map.class)) {
+        ParameterizedType map = (ParameterizedType) f.getGenericType();
+        Class<?> key = (Class<?>) map.getActualTypeArguments()[0];
+        if (map.getActualTypeArguments()[1] instanceof ParameterizedType) {
+          // TODO: This is list multimap which proto doesn't support. Move to
+          // it's own types.
+          proto.append(
+              "reserved "
+                  + fieldNumber
+                  + "; // TODO(hiesel): Add support for map<?,repeated <?>>\n");
+        } else {
+          Class<?> value = (Class<?>) map.getActualTypeArguments()[1];
+          String keyProtoType =
+              protoType(key).orElseThrow(() -> new IllegalStateException("unknown type: " + key));
+          String valueProtoType =
+              protoType(value)
+                  .orElseThrow(() -> new IllegalStateException("unknown type: " + value));
+          proto.append(
+              String.format(
+                  "map<%s,%s> %s = %d;\n",
+                  keyProtoType, valueProtoType, protoName(f.getName()), fieldNumber));
+        }
+      } else if (protoType(type).isPresent()) {
+        proto.append(
+            String.format(
+                "%s %s = %d;\n", protoType(type).get(), protoName(f.getName()), fieldNumber));
+      } else {
+        proto.append(
+            "reserved "
+                + fieldNumber
+                + "; // TODO(hiesel): Add support for "
+                + type.getName()
+                + "\n");
+      }
+      fieldNumber++;
+    }
+    proto.append("}");
+
+    System.out.println(proto);
+  }
+
+  private static Optional<String> protoType(Class<?> type) {
+    if (isInt(type)) {
+      return Optional.of("int32");
+    } else if (isLong(type)) {
+      return Optional.of("int64");
+    } else if (isChar(type)) {
+      return Optional.of("string");
+    } else if (isShort(type)) {
+      return Optional.of("int32");
+    } else if (isShort(type)) {
+      return Optional.of("int32");
+    } else if (isBoolean(type)) {
+      return Optional.of("bool");
+    } else if (type.isAssignableFrom(String.class)) {
+      return Optional.of("string");
+    } else if (type.isAssignableFrom(Timestamp.class)) {
+      // See https://gerrit-review.googlesource.com/Documentation/rest-api.html#timestamp
+      return Optional.of("string");
+    } else if (type.getPackageName().startsWith("com.google.gerrit.extensions")) {
+      return Optional.of("gerrit.api." + type.getSimpleName());
+    }
+    return Optional.empty();
+  }
+
+  private static boolean isInt(Class<?> type) {
+    return type.isAssignableFrom(Integer.class) || type.isAssignableFrom(int.class);
+  }
+
+  private static boolean isLong(Class<?> type) {
+    return type.isAssignableFrom(Long.class) || type.isAssignableFrom(long.class);
+  }
+
+  private static boolean isChar(Class<?> type) {
+    return type.isAssignableFrom(Character.class) || type.isAssignableFrom(char.class);
+  }
+
+  private static boolean isShort(Class<?> type) {
+    return type.isAssignableFrom(Short.class) || type.isAssignableFrom(short.class);
+  }
+
+  private static boolean isBoolean(Class<?> type) {
+    return type.isAssignableFrom(Boolean.class) || type.isAssignableFrom(boolean.class);
+  }
+
+  private static String protoName(String name) {
+    return CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, name);
+  }
+}
diff --git a/java/com/google/gerrit/util/cli/BUILD b/java/com/google/gerrit/util/cli/BUILD
index ebcc67e..b464f32 100644
--- a/java/com/google/gerrit/util/cli/BUILD
+++ b/java/com/google/gerrit/util/cli/BUILD
@@ -2,7 +2,10 @@
 
 java_library(
     name = "cli",
-    srcs = glob(["**/*.java"]),
+    srcs = glob(
+        ["**/*.java"],
+        exclude = ["ApiProtocolBufferGenerator.java"],
+    ),
     visibility = ["//visibility:public"],
     deps = [
         "//java/com/google/gerrit/common:annotations",
@@ -14,3 +17,15 @@
         "//lib/guice:guice-assistedinject",
     ],
 )
+
+# Util to generate *.proto files from *Info and *Input objects
+java_binary(
+    name = "protogen",
+    srcs = ["ApiProtocolBufferGenerator.java"],
+    main_class = "com.google.gerrit.util.cli.ApiProtocolBufferGenerator",
+    deps = [
+        "//java/com/google/gerrit/extensions:api",
+        "//lib:guava",
+        "//lib:protobuf",
+    ],
+)
diff --git a/javatests/com/google/gerrit/acceptance/api/change/RebaseIT.java b/javatests/com/google/gerrit/acceptance/api/change/RebaseIT.java
index 74bd94e..522013e 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/RebaseIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/RebaseIT.java
@@ -399,7 +399,11 @@
       String changeId = r2.getChangeId();
       requestScopeOperations.setApiUser(user.id());
       AuthException thrown = assertThrows(AuthException.class, () -> rebaseCall.call(changeId));
-      assertThat(thrown).hasMessageThat().contains("rebase not permitted");
+      assertThat(thrown)
+          .hasMessageThat()
+          .isEqualTo(
+              "rebase not permitted (change owners and users with the 'Submit' or 'Rebase'"
+                  + " permission can rebase if they have the 'Push' permission)");
     }
 
     @Test
@@ -449,7 +453,11 @@
       String changeId = r2.getChangeId();
       requestScopeOperations.setApiUser(user.id());
       AuthException thrown = assertThrows(AuthException.class, () -> rebaseCall.call(changeId));
-      assertThat(thrown).hasMessageThat().contains("rebase not permitted");
+      assertThat(thrown)
+          .hasMessageThat()
+          .isEqualTo(
+              "rebase not permitted (change owners and users with the 'Submit' or 'Rebase'"
+                  + " permission can rebase if they have the 'Push' permission)");
     }
 
     @Test
@@ -473,7 +481,11 @@
       // Rebase the second
       String changeId = r2.getChangeId();
       AuthException thrown = assertThrows(AuthException.class, () -> rebaseCall.call(changeId));
-      assertThat(thrown).hasMessageThat().contains("rebase not permitted");
+      assertThat(thrown)
+          .hasMessageThat()
+          .isEqualTo(
+              "rebase not permitted (change owners and users with the 'Submit' or 'Rebase'"
+                  + " permission can rebase if they have the 'Push' permission)");
     }
 
     @Test
diff --git a/javatests/com/google/gerrit/acceptance/api/change/SubmitRequirementIT.java b/javatests/com/google/gerrit/acceptance/api/change/SubmitRequirementIT.java
index 242c278..ab2f358 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/SubmitRequirementIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/SubmitRequirementIT.java
@@ -33,6 +33,7 @@
 import com.google.gerrit.acceptance.ExtensionRegistry.Registration;
 import com.google.gerrit.acceptance.NoHttpd;
 import com.google.gerrit.acceptance.PushOneCommit;
+import com.google.gerrit.acceptance.TestAccount;
 import com.google.gerrit.acceptance.UseTimezone;
 import com.google.gerrit.acceptance.VerifyNoPiiInChangeNotes;
 import com.google.gerrit.acceptance.testsuite.change.IndexOperations;
@@ -424,6 +425,26 @@
   }
 
   @Test
+  public void checkSubmitRequirement_verifiesUploader() throws Exception {
+    PushOneCommit.Result r = createChange();
+    String changeId = r.getChangeId();
+    voteLabel(changeId, "Code-Review", 2);
+    TestAccount anotherUser = accountCreator.createValid("anotherUser");
+
+    SubmitRequirementInput in =
+        createSubmitRequirementInput(
+            "Foo", /* submittabilityExpression= */ "uploader:" + anotherUser.id());
+    SubmitRequirementResultInfo result = gApi.changes().id(changeId).checkSubmitRequirement(in);
+    assertThat(result.status).isEqualTo(SubmitRequirementResultInfo.Status.UNSATISFIED);
+
+    in =
+        createSubmitRequirementInput(
+            "Foo", /* submittabilityExpression= */ "uploader:" + r.getChange().change().getOwner());
+    result = gApi.changes().id(changeId).checkSubmitRequirement(in);
+    assertThat(result.status).isEqualTo(SubmitRequirementResultInfo.Status.SATISFIED);
+  }
+
+  @Test
   public void submitRequirement_withLabelEqualsMax() throws Exception {
     configSubmitRequirement(
         project,
diff --git a/javatests/com/google/gerrit/acceptance/server/experiments/ExperimentFeaturesIT.java b/javatests/com/google/gerrit/acceptance/server/experiments/ExperimentFeaturesIT.java
index b2a0ded..e011ffc 100644
--- a/javatests/com/google/gerrit/acceptance/server/experiments/ExperimentFeaturesIT.java
+++ b/javatests/com/google/gerrit/acceptance/server/experiments/ExperimentFeaturesIT.java
@@ -68,10 +68,7 @@
       values = {"UiFeature__patchset_comments", "UiFeature__submit_requirements_ui"})
   public void configOverride_defaultFeatureDisabled() {
     assertThat(experimentFeatures.isFeatureEnabled("enabledFeature")).isTrue();
-    assertThat(
-            experimentFeatures.isFeatureEnabled(
-                ExperimentFeaturesConstants.UI_FEATURE_PATCHSET_COMMENTS))
-        .isFalse();
+    assertThat(experimentFeatures.isFeatureEnabled("UiFeature__patchset_comments")).isFalse();
     assertThat(experimentFeatures.getEnabledExperimentFeatures()).containsExactly("enabledFeature");
   }
 }
diff --git a/javatests/com/google/gerrit/acceptance/testsuite/change/ChangeOperationsImplTest.java b/javatests/com/google/gerrit/acceptance/testsuite/change/ChangeOperationsImplTest.java
index 6c629c9..fd5f6fc 100644
--- a/javatests/com/google/gerrit/acceptance/testsuite/change/ChangeOperationsImplTest.java
+++ b/javatests/com/google/gerrit/acceptance/testsuite/change/ChangeOperationsImplTest.java
@@ -795,6 +795,23 @@
   }
 
   @Test
+  public void newPatchsetCanHaveDifferentUploader() throws Exception {
+    Account.Id changeOwner = accountOperations.newAccount().create();
+    Change.Id changeId = changeOperations.newChange().owner(changeOwner).create();
+
+    ChangeInfo change = getChangeFromServer(changeId);
+    RevisionInfo currentPatchsetRevision = change.revisions.get(change.currentRevision);
+    assertThat(currentPatchsetRevision.uploader._accountId).isEqualTo(changeOwner.get());
+
+    Account.Id newUploader = accountOperations.newAccount().create();
+    changeOperations.change(changeId).newPatchset().uploader(newUploader).create();
+
+    change = getChangeFromServer(changeId);
+    currentPatchsetRevision = change.revisions.get(change.currentRevision);
+    assertThat(currentPatchsetRevision.uploader._accountId).isEqualTo(newUploader.get());
+  }
+
+  @Test
   public void newPatchsetCanHaveUpdatedCommitMessage() throws Exception {
     Change.Id changeId = changeOperations.newChange().commitMessage("Old message").create();
 
diff --git a/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java b/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
index f65e823..06ea8b6 100644
--- a/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
+++ b/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
@@ -60,15 +60,13 @@
     String testCdnPath = "bar-cdn";
     String testFaviconURL = "zaz-url";
 
-    // Pick any known experiment enabled by default;
-    String disabledDefault = ExperimentFeaturesConstants.UI_FEATURE_PATCHSET_COMMENTS;
-    assertThat(ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES).contains(disabledDefault);
+    assertThat(ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES).isEmpty();
 
     org.eclipse.jgit.lib.Config serverConfig = new org.eclipse.jgit.lib.Config();
     serverConfig.setStringList(
         "experiments", null, "enabled", ImmutableList.of("NewFeature", "DisabledFeature"));
     serverConfig.setStringList(
-        "experiments", null, "disabled", ImmutableList.of("DisabledFeature", disabledDefault));
+        "experiments", null, "disabled", ImmutableList.of("DisabledFeature"));
     ExperimentFeatures experimentFeatures = new ConfigExperimentFeatures(serverConfig);
     IndexServlet servlet =
         new IndexServlet(
@@ -97,7 +95,6 @@
                 + "\\x5b\\x5d\\x7d');");
     ImmutableSet<String> enabledDefaults =
         ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES.stream()
-            .filter(e -> !e.equals(disabledDefault))
             .collect(ImmutableSet.toImmutableSet());
     List<String> expectedEnabled = new ArrayList<>();
     expectedEnabled.add("NewFeature");
diff --git a/javatests/com/google/gerrit/server/notedb/ChangeNotesTest.java b/javatests/com/google/gerrit/server/notedb/ChangeNotesTest.java
index 61b5e55..9cd002e 100644
--- a/javatests/com/google/gerrit/server/notedb/ChangeNotesTest.java
+++ b/javatests/com/google/gerrit/server/notedb/ChangeNotesTest.java
@@ -825,7 +825,8 @@
         ImmutableList.of(", ", ":\"", ",", "!@#$%^\0&*):\" \n: \r\"#$@,. :");
     for (String strangeTag : strangeTags) {
       Change c = newChange();
-      CurrentUser otherUserAsOwner = userFactory.runAs(null, changeOwner.getAccountId(), otherUser);
+      CurrentUser otherUserAsOwner =
+          userFactory.runAs(/* remotePeer= */ null, changeOwner.getAccountId(), otherUser);
       ChangeUpdate update = newUpdate(c, otherUserAsOwner);
       update.putApproval(LabelId.CODE_REVIEW, (short) 2);
       update.setTag(strangeTag);
diff --git a/javatests/com/google/gerrit/server/notedb/CommitMessageOutputTest.java b/javatests/com/google/gerrit/server/notedb/CommitMessageOutputTest.java
index b53de89..25f2f98 100644
--- a/javatests/com/google/gerrit/server/notedb/CommitMessageOutputTest.java
+++ b/javatests/com/google/gerrit/server/notedb/CommitMessageOutputTest.java
@@ -354,7 +354,8 @@
   @Test
   public void realUser() throws Exception {
     Change c = newChange();
-    CurrentUser ownerAsOtherUser = userFactory.runAs(null, otherUserId, changeOwner);
+    CurrentUser ownerAsOtherUser =
+        userFactory.runAs(/* remotePeer= */ null, otherUserId, changeOwner);
     ChangeUpdate update = newUpdate(c, ownerAsOtherUser);
     update.setChangeMessage("Message on behalf of other user");
     update.commit();
diff --git a/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java b/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java
index 5e6803e..527e78e 100644
--- a/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java
+++ b/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java
@@ -399,7 +399,9 @@
 
     IdentifiedUser impersonatedChangeOwner =
         this.userFactory.runAs(
-            null, changeOwner.getAccountId(), requireNonNull(otherUser).getRealUser());
+            /* remotePeer= */ null,
+            changeOwner.getAccountId(),
+            requireNonNull(otherUser).getRealUser());
     ChangeUpdate impersonatedChangeMessageUpdate = newUpdate(c, impersonatedChangeOwner);
     impersonatedChangeMessageUpdate.setChangeMessage("Other comment on behalf of");
     impersonatedChangeMessageUpdate.commit();
diff --git a/modules/jgit b/modules/jgit
index 801a56b..a190130 160000
--- a/modules/jgit
+++ b/modules/jgit
@@ -1 +1 @@
-Subproject commit 801a56b48a7fe3c6e171073211cc62194184fe79
+Subproject commit a1901305b26ed5e0116f138bc02837713d2cf5c3
diff --git a/polygerrit-ui/app/api/diff.ts b/polygerrit-ui/app/api/diff.ts
index ce9ce2d..e3b3ad4 100644
--- a/polygerrit-ui/app/api/diff.ts
+++ b/polygerrit-ui/app/api/diff.ts
@@ -201,7 +201,7 @@
   syntax_highlighting?: boolean;
   tab_size: number;
   font_size: number;
-  // TODO: Missing documentation
+  // Hides the FILE and LOST diff rows. Default is TRUE.
   show_file_comment_button?: boolean;
   line_wrapping?: boolean;
 }
diff --git a/polygerrit-ui/app/constants/constants.ts b/polygerrit-ui/app/constants/constants.ts
index 89c7622..f915432 100644
--- a/polygerrit-ui/app/constants/constants.ts
+++ b/polygerrit-ui/app/constants/constants.ts
@@ -319,6 +319,4 @@
 
 export const RELOAD_DASHBOARD_INTERVAL_MS = 10 * 1000;
 
-export const SHOWN_ITEMS_COUNT = 25;
-
 export const WAITING = 'Waiting';
diff --git a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts
index d3562f2..893a997 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts
@@ -10,7 +10,6 @@
 import {GrCreateGroupDialog} from '../gr-create-group-dialog/gr-create-group-dialog';
 import {fireTitleChange} from '../../../utils/event-util';
 import {getAppContext} from '../../../services/app-context';
-import {SHOWN_ITEMS_COUNT} from '../../../constants/constants';
 import {tableStyles} from '../../../styles/gr-table-styles';
 import {sharedStyles} from '../../../styles/shared-styles';
 import {LitElement, PropertyValues, css, html} from 'lit';
@@ -43,21 +42,19 @@
   /**
    * Offset of currently visible query results.
    */
-  @state() private offset = 0;
+  @state() offset = 0;
 
-  @state() private hasNewGroupName = false;
+  @state() hasNewGroupName = false;
 
-  @state() private createNewCapability = false;
+  @state() createNewCapability = false;
 
-  // private but used in test
   @state() groups: GroupInfo[] = [];
 
-  @state() private groupsPerPage = 25;
+  @state() groupsPerPage = 25;
 
-  // private but used in test
   @state() loading = true;
 
-  @state() private filter = '';
+  @state() filter = '';
 
   private readonly restApiService = getAppContext().restApiService;
 
@@ -108,7 +105,7 @@
           </tbody>
           <tbody class=${this.loading ? 'loading' : ''}>
             ${this.groups
-              .slice(0, SHOWN_ITEMS_COUNT)
+              .slice(0, this.groupsPerPage)
               .map(group => this.renderGroupList(group))}
           </tbody>
         </table>
diff --git a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list_test.ts b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list_test.ts
index e9b7ea0..fe5aa22 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list_test.ts
+++ b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list_test.ts
@@ -15,7 +15,6 @@
 import {GerritView} from '../../../services/router/router-model';
 import {GrListView} from '../../shared/gr-list-view/gr-list-view';
 import {GrDialog} from '../../shared/gr-dialog/gr-dialog';
-import {SHOWN_ITEMS_COUNT} from '../../../constants/constants';
 import {fixture, html, assert} from '@open-wc/testing';
 import {AdminChildView, AdminViewState} from '../../../models/views/admin';
 
@@ -117,7 +116,9 @@
     });
 
     test('groups', () => {
-      assert.equal(element.groups.slice(0, SHOWN_ITEMS_COUNT).length, 25);
+      const table = queryAndAssert(element, 'table');
+      const rows = table.querySelectorAll('tr.table');
+      assert.equal(rows.length, element.groupsPerPage);
     });
 
     test('maybeOpenCreateModal', async () => {
@@ -145,7 +146,9 @@
     });
 
     test('groups', () => {
-      assert.equal(element.groups.slice(0, SHOWN_ITEMS_COUNT).length, 25);
+      const table = queryAndAssert(element, 'table');
+      const rows = table.querySelectorAll('tr.table');
+      assert.equal(rows.length, element.groupsPerPage);
     });
   });
 
diff --git a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts
index 8d5689c..96688e9 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts
@@ -6,7 +6,6 @@
 import '@polymer/iron-input/iron-input';
 import '../../../styles/gr-form-styles';
 import '../../../styles/shared-styles';
-import {page} from '../../../utils/page-wrapper-utils';
 import {GroupId, GroupName} from '../../../types/common';
 import {getAppContext} from '../../../services/app-context';
 import {formStyles} from '../../../styles/gr-form-styles';
@@ -16,6 +15,8 @@
 import {BindValueChangeEvent} from '../../../types/events';
 import {fireEvent} from '../../../utils/event-util';
 import {createGroupUrl} from '../../../models/views/group';
+import {resolve} from '../../../models/dependency';
+import {navigationToken} from '../../core/gr-navigation/gr-navigation';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -32,6 +33,8 @@
 
   private readonly restApiService = getAppContext().restApiService;
 
+  private readonly getNavigation = resolve(this, navigationToken);
+
   static override get styles() {
     return [
       formStyles,
@@ -86,8 +89,7 @@
       return this.restApiService.getGroupConfig(name).then(group => {
         if (!group) return;
         const groupId = String(group.group_id!) as GroupId;
-        // TODO: Use navigation service instead of `page.show()` directly.
-        page.show(createGroupUrl({groupId}));
+        this.getNavigation().setUrl(createGroupUrl({groupId}));
       });
     });
   }
diff --git a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog_test.ts b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog_test.ts
index 2a0b539..6e36d8c 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog_test.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog_test.ts
@@ -6,7 +6,6 @@
 import '../../../test/common-test-setup';
 import './gr-create-group-dialog';
 import {GrCreateGroupDialog} from './gr-create-group-dialog';
-import {page} from '../../../utils/page-wrapper-utils';
 import {
   mockPromise,
   queryAndAssert,
@@ -15,6 +14,8 @@
 import {IronInputElement} from '@polymer/iron-input';
 import {GroupId} from '../../../types/common';
 import {fixture, html, assert} from '@open-wc/testing';
+import {testResolver} from '../../../test/common-test-setup';
+import {navigationToken} from '../../core/gr-navigation/gr-navigation';
 
 suite('gr-create-group-dialog tests', () => {
   let element: GrCreateGroupDialog;
@@ -68,9 +69,9 @@
       Promise.resolve({id: 'testId551' as GroupId, group_id: 551})
     );
 
-    const showStub = sinon.stub(page, 'show');
+    const setUrlStub = sinon.stub(testResolver(navigationToken), 'setUrl');
     await element.handleCreateGroup();
-    assert.isTrue(showStub.calledWith('/admin/groups/551'));
+    assert.isTrue(setUrlStub.calledWith('/admin/groups/551'));
   });
 
   test('test for unsuccessful group creation', async () => {
@@ -81,8 +82,8 @@
       Promise.resolve({id: 'testId551' as GroupId, group_id: 551})
     );
 
-    const showStub = sinon.stub(page, 'show');
+    const setUrlStub = sinon.stub(testResolver(navigationToken), 'setUrl');
     await element.handleCreateGroup();
-    assert.isFalse(showStub.called);
+    assert.isFalse(setUrlStub.called);
   });
 });
diff --git a/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts b/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts
index bb59ccc..ed57830 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts
@@ -7,7 +7,6 @@
 import '../../shared/gr-autocomplete/gr-autocomplete';
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-select/gr-select';
-import {page} from '../../../utils/page-wrapper-utils';
 import {
   BranchName,
   GroupId,
@@ -24,6 +23,8 @@
 import {fireEvent} from '../../../utils/event-util';
 import {throwingErrorCallback} from '../../shared/gr-rest-api-interface/gr-rest-apis/gr-rest-api-helper';
 import {createRepoUrl} from '../../../models/views/repo';
+import {resolve} from '../../../models/dependency';
+import {navigationToken} from '../../core/gr-navigation/gr-navigation';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -71,6 +72,8 @@
 
   private readonly restApiService = getAppContext().restApiService;
 
+  private readonly getNavigation = resolve(this, navigationToken);
+
   constructor() {
     super();
     this.query = (input: string) => this.getRepoSuggestions(input);
@@ -195,8 +198,7 @@
     );
     if (repoRegistered.status === 201) {
       this.repoCreated = true;
-      // TODO: Use navigation service instead of `page.show()` directly.
-      page.show(createRepoUrl({repo: this.repoConfig.name}));
+      this.getNavigation().setUrl(createRepoUrl({repo: this.repoConfig.name}));
     }
     return repoRegistered;
   }
diff --git a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts
index 383b4a7..944cd7a 100644
--- a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts
@@ -9,7 +9,6 @@
 import {getAppContext} from '../../../services/app-context';
 import {ErrorCallback} from '../../../api/rest';
 import {encodeURL, getBaseUrl} from '../../../utils/url-util';
-import {SHOWN_ITEMS_COUNT} from '../../../constants/constants';
 import {tableStyles} from '../../../styles/gr-table-styles';
 import {sharedStyles} from '../../../styles/shared-styles';
 import {LitElement, PropertyValues, css, html} from 'lit';
@@ -34,17 +33,15 @@
   /**
    * Offset of currently visible query results.
    */
-  @state() private offset = 0;
+  @state() offset = 0;
 
-  // private but used in test
   @state() plugins?: PluginInfoWithName[];
 
-  @state() private pluginsPerPage = 25;
+  @state() pluginsPerPage = 25;
 
-  // private but used in test
   @state() loading = true;
 
-  @state() private filter = '';
+  @state() filter = '';
 
   private readonly restApiService = getAppContext().restApiService;
 
@@ -107,7 +104,7 @@
     return html`
       <tbody>
         ${this.plugins
-          ?.slice(0, SHOWN_ITEMS_COUNT)
+          ?.slice(0, this.pluginsPerPage)
           .map(plugin => this.renderPluginList(plugin))}
       </tbody>
     `;
diff --git a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list_test.ts b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list_test.ts
index 4057e52..34c88be 100644
--- a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list_test.ts
+++ b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list_test.ts
@@ -17,7 +17,6 @@
 import {PluginInfo} from '../../../types/common';
 import {GerritView} from '../../../services/router/router-model';
 import {PageErrorEvent} from '../../../types/events';
-import {SHOWN_ITEMS_COUNT} from '../../../constants/constants';
 import {fixture, html, assert} from '@open-wc/testing';
 import {AdminChildView, AdminViewState} from '../../../models/views/admin';
 
@@ -334,7 +333,9 @@
     });
 
     test('plugins', () => {
-      assert.equal(element.plugins!.slice(0, SHOWN_ITEMS_COUNT).length, 25);
+      const table = queryAndAssert(element, 'table');
+      const rows = table.querySelectorAll('tr.table');
+      assert.equal(rows.length, element.pluginsPerPage);
     });
   });
 
@@ -348,7 +349,9 @@
     });
 
     test('plugins', () => {
-      assert.equal(element.plugins!.slice(0, SHOWN_ITEMS_COUNT).length, 25);
+      const table = queryAndAssert(element, 'table');
+      const rows = table.querySelectorAll('tr.table');
+      assert.equal(rows.length, element.pluginsPerPage);
     });
   });
 
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
index 7eef7a4..981cbe4 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
@@ -25,7 +25,6 @@
 import {firePageError} from '../../../utils/event-util';
 import {getAppContext} from '../../../services/app-context';
 import {ErrorCallback} from '../../../api/rest';
-import {SHOWN_ITEMS_COUNT} from '../../../constants/constants';
 import {formStyles} from '../../../styles/gr-form-styles';
 import {tableStyles} from '../../../styles/gr-table-styles';
 import {sharedStyles} from '../../../styles/shared-styles';
@@ -51,36 +50,30 @@
   @property({type: Object})
   params?: RepoViewState;
 
-  // private but used in test
   @state() detailType?: RepoDetailView.BRANCHES | RepoDetailView.TAGS;
 
-  // private but used in test
   @state() isOwner = false;
 
-  @state() private loggedIn = false;
+  @state() loggedIn = false;
 
-  @state() private offset = 0;
+  @state() offset = 0;
 
-  // private but used in test
   @state() repo?: RepoName;
 
-  // private but used in test
   @state() items?: BranchInfo[] | TagInfo[];
 
-  @state() private readonly itemsPerPage = 25;
+  @state() readonly itemsPerPage = 25;
 
-  @state() private loading = true;
+  @state() loading = true;
 
-  @state() private filter?: string;
+  @state() filter?: string;
 
-  @state() private refName?: GitRef;
+  @state() refName?: GitRef;
 
-  @state() private newItemName = false;
+  @state() newItemName = false;
 
-  // private but used in test
   @state() isEditing = false;
 
-  // private but used in test
   @state() revisedRef?: GitRef;
 
   private readonly restApiService = getAppContext().restApiService;
@@ -185,7 +178,7 @@
           </tbody>
           <tbody class=${this.loading ? 'loading' : ''}>
             ${this.items
-              ?.slice(0, SHOWN_ITEMS_COUNT)
+              ?.slice(0, this.itemsPerPage)
               .map((item, index) => this.renderItemList(item, index))}
           </tbody>
         </table>
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_test.ts b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_test.ts
index ec1bb82..9a67fda 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_test.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_test.ts
@@ -6,7 +6,6 @@
 import '../../../test/common-test-setup';
 import './gr-repo-detail-list';
 import {GrRepoDetailList} from './gr-repo-detail-list';
-import {page} from '../../../utils/page-wrapper-utils';
 import {
   addListenerForTest,
   mockPromise,
@@ -32,9 +31,10 @@
 import {PageErrorEvent} from '../../../types/events';
 import {GrDialog} from '../../shared/gr-dialog/gr-dialog';
 import {GrListView} from '../../shared/gr-list-view/gr-list-view';
-import {SHOWN_ITEMS_COUNT} from '../../../constants/constants';
 import {fixture, html, assert} from '@open-wc/testing';
 import {RepoDetailView} from '../../../models/views/repo';
+import {testResolver} from '../../../test/common-test-setup';
+import {navigationToken} from '../../core/gr-navigation/gr-navigation';
 
 function branchGenerator(counter: number) {
   return {
@@ -96,7 +96,7 @@
         html`<gr-repo-detail-list></gr-repo-detail-list>`
       );
       element.detailType = RepoDetailView.BRANCHES;
-      sinon.stub(page, 'show');
+      sinon.stub(testResolver(navigationToken), 'setUrl');
     });
 
     suite('list of repo branches', () => {
@@ -2339,7 +2339,7 @@
         html`<gr-repo-detail-list></gr-repo-detail-list>`
       );
       element.detailType = RepoDetailView.TAGS;
-      sinon.stub(page, 'show');
+      sinon.stub(testResolver(navigationToken), 'setUrl');
     });
 
     suite('list of repo tags', () => {
@@ -2391,7 +2391,9 @@
       });
 
       test('items', () => {
-        assert.equal(element.items!.slice(0, SHOWN_ITEMS_COUNT)!.length, 25);
+        const table = queryAndAssert(element, 'table');
+        const rows = table.querySelectorAll('tr.table');
+        assert.equal(rows.length, element.itemsPerPage);
       });
     });
 
@@ -2411,7 +2413,9 @@
       });
 
       test('items', () => {
-        assert.equal(element.items!.slice(0, SHOWN_ITEMS_COUNT)!.length, 25);
+        const table = queryAndAssert(element, 'table');
+        const rows = table.querySelectorAll('tr.table');
+        assert.equal(rows.length, element.itemsPerPage);
       });
     });
 
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts
index 2fd7e79..055cb30 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts
@@ -8,7 +8,7 @@
 import '../gr-create-repo-dialog/gr-create-repo-dialog';
 import {ProjectInfoWithName, WebLinkInfo} from '../../../types/common';
 import {GrCreateRepoDialog} from '../gr-create-repo-dialog/gr-create-repo-dialog';
-import {RepoState, SHOWN_ITEMS_COUNT} from '../../../constants/constants';
+import {RepoState} from '../../../constants/constants';
 import {fireTitleChange} from '../../../utils/event-util';
 import {getAppContext} from '../../../services/app-context';
 import {tableStyles} from '../../../styles/gr-table-styles';
@@ -39,23 +39,18 @@
   @property({type: Object})
   params?: AdminViewState;
 
-  // private but used in test
   @state() offset = 0;
 
-  @state() private newRepoName = false;
+  @state() newRepoName = false;
 
-  @state() private createNewCapability = false;
+  @state() createNewCapability = false;
 
-  // private but used in test
   @state() repos: ProjectInfoWithName[] = [];
 
-  // private but used in test
   @state() reposPerPage = 25;
 
-  // private but used in test
   @state() loading = true;
 
-  // private but used in test
   @state() filter = '';
 
   private readonly restApiService = getAppContext().restApiService;
@@ -147,7 +142,7 @@
   }
 
   private renderRepoList() {
-    const shownRepos = this.repos.slice(0, SHOWN_ITEMS_COUNT);
+    const shownRepos = this.repos.slice(0, this.reposPerPage);
     return shownRepos.map(item => this.renderRepo(item));
   }
 
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_test.ts b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_test.ts
index 5b65942..906b733 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_test.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_test.ts
@@ -6,7 +6,6 @@
 import '../../../test/common-test-setup';
 import './gr-repo-list';
 import {GrRepoList} from './gr-repo-list';
-import {page} from '../../../utils/page-wrapper-utils';
 import {
   mockPromise,
   queryAndAssert,
@@ -17,12 +16,14 @@
   ProjectInfoWithName,
   RepoName,
 } from '../../../types/common';
-import {RepoState, SHOWN_ITEMS_COUNT} from '../../../constants/constants';
+import {RepoState} from '../../../api/rest-api';
 import {GerritView} from '../../../services/router/router-model';
 import {GrDialog} from '../../shared/gr-dialog/gr-dialog';
 import {GrListView} from '../../shared/gr-list-view/gr-list-view';
 import {fixture, html, assert} from '@open-wc/testing';
 import {AdminChildView, AdminViewState} from '../../../models/views/admin';
+import {testResolver} from '../../../test/common-test-setup';
+import {navigationToken} from '../../core/gr-navigation/gr-navigation';
 
 function createRepo(name: string, counter: number) {
   return {
@@ -51,7 +52,7 @@
   let repos: ProjectInfoWithName[];
 
   setup(async () => {
-    sinon.stub(page, 'show');
+    sinon.stub(testResolver(navigationToken), 'setUrl');
     element = await fixture(html`<gr-repo-list></gr-repo-list>`);
   });
 
@@ -614,7 +615,9 @@
     });
 
     test('shownRepos', () => {
-      assert.equal(element.repos.slice(0, SHOWN_ITEMS_COUNT).length, 25);
+      const table = queryAndAssert(element, 'table');
+      const rows = table.querySelectorAll('tr.table');
+      assert.equal(rows.length, element.reposPerPage);
     });
 
     test('maybeOpenCreateModal', () => {
@@ -645,7 +648,9 @@
     });
 
     test('shownRepos', () => {
-      assert.equal(element.repos.slice(0, SHOWN_ITEMS_COUNT).length, 25);
+      const table = queryAndAssert(element, 'table');
+      const rows = table.querySelectorAll('tr.table');
+      assert.equal(rows.length, element.reposPerPage);
     });
   });
 
diff --git a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts
index 8d6d89a..3599224 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts
@@ -25,7 +25,7 @@
   RepoState,
   SubmitType,
 } from '../../../constants/constants';
-import {hasOwnProperty} from '../../../utils/common-util';
+import {assertIsDefined, hasOwnProperty} from '../../../utils/common-util';
 import {firePageError, fireTitleChange} from '../../../utils/event-util';
 import {getAppContext} from '../../../services/app-context';
 import {WebLinkInfo} from '../../../types/diff';
@@ -36,8 +36,9 @@
 import {sharedStyles} from '../../../styles/shared-styles';
 import {BindValueChangeEvent} from '../../../types/events';
 import {deepClone} from '../../../utils/deep-util';
-import {LitElement, PropertyValues, css, html} from 'lit';
+import {LitElement, PropertyValues, css, html, nothing} from 'lit';
 import {customElement, property, state} from 'lit/decorators.js';
+import {when} from 'lit/directives/when.js';
 import {subscribe} from '../../lit/subscription-controller';
 import {createSearchUrl} from '../../../models/views/search';
 import {userModelToken} from '../../../models/user/user-model';
@@ -150,16 +151,6 @@
           color: var(--deemphasized-text-color);
           content: ' *';
         }
-        .loading,
-        .hide {
-          display: none;
-        }
-        #loading.loading {
-          display: block;
-        }
-        #loading:not(.loading) {
-          display: none;
-        }
         #options .repositorySettings {
           display: none;
         }
@@ -187,49 +178,48 @@
             >
           </div>
         </div>
-        <div id="loading" class=${this.loading ? 'loading' : ''}>
-          Loading...
-        </div>
-        <div id="loadedContent" class=${this.loading ? 'loading' : ''}>
-          ${this.renderDownloadCommands()}
-          <h2
-            id="configurations"
-            class="heading-2 ${configChanged ? 'edited' : ''}"
-          >
-            Configurations
-          </h2>
-          <div id="form">
-            <fieldset>
-              ${this.renderDescription()} ${this.renderRepoOptions()}
-              ${this.renderPluginConfig()}
-              <gr-button
-                ?disabled=${this.readOnly || !configChanged}
-                @click=${this.handleSaveRepoConfig}
-                >Save changes</gr-button
-              >
-            </fieldset>
-            <gr-endpoint-decorator name="repo-config">
-              <gr-endpoint-param
-                name="repoName"
-                .value=${this.repo}
-              ></gr-endpoint-param>
-              <gr-endpoint-param
-                name="readOnly"
-                .value=${this.readOnly}
-              ></gr-endpoint-param>
-            </gr-endpoint-decorator>
-          </div>
-        </div>
+        ${when(
+          this.loading || !this.repoConfig,
+          () => html`<div id="loading">Loading...</div>`,
+          () => html`<div id="loadedContent">
+            ${this.renderDownloadCommands()}
+            <h2
+              id="configurations"
+              class="heading-2 ${configChanged ? 'edited' : ''}"
+            >
+              Configurations
+            </h2>
+            <div id="form">
+              <fieldset>
+                ${this.renderDescription()} ${this.renderRepoOptions()}
+                ${this.renderPluginConfig()}
+                <gr-button
+                  ?disabled=${this.readOnly || !configChanged}
+                  @click=${this.handleSaveRepoConfig}
+                  >Save changes</gr-button
+                >
+              </fieldset>
+              <gr-endpoint-decorator name="repo-config">
+                <gr-endpoint-param
+                  name="repoName"
+                  .value=${this.repo}
+                ></gr-endpoint-param>
+                <gr-endpoint-param
+                  name="readOnly"
+                  .value=${this.readOnly}
+                ></gr-endpoint-param>
+              </gr-endpoint-decorator>
+            </div>
+          </div>`
+        )}
       </div>
     `;
   }
 
   private renderDownloadCommands() {
+    if (!this.schemes.length) return nothing;
     return html`
-      <div
-        id="downloadContent"
-        class=${!this.schemes || !this.schemes.length ? 'hide' : ''}
-      >
+      <div id="downloadContent">
         <h2 id="download" class="heading-2">Download</h2>
         <fieldset>
           <gr-download-commands
@@ -252,6 +242,7 @@
   }
 
   private renderDescription() {
+    assertIsDefined(this.repoConfig, 'repoConfig');
     return html`
       <h3 id="Description" class="heading-3">Description</h3>
       <fieldset>
@@ -263,7 +254,7 @@
           rows="4"
           monospace
           ?disabled=${this.readOnly}
-          .text=${this.repoConfig?.description ?? ''}
+          .text=${this.repoConfig.description ?? ''}
           @text-changed=${this.handleDescriptionTextChanged}
         ></gr-textarea>
       </fieldset>
@@ -725,8 +716,9 @@
 
   private renderPluginConfig() {
     const pluginData = this.computePluginData();
+    if (!pluginData.length) return nothing;
     return html` <div
-      class="pluginConfig ${!pluginData || !pluginData.length ? 'hide' : ''}"
+      class="pluginConfig"
       @plugin-config-changed=${this.handlePluginConfigChanged}
     >
       <h3 class="heading-3">Plugins</h3>
@@ -762,6 +754,12 @@
   // private but used in test
   async loadRepo() {
     if (!this.repo) return Promise.resolve();
+    this.repoConfig = undefined;
+    this.originalConfig = undefined;
+    this.loading = true;
+    this.weblinks = [];
+    this.schemesObj = undefined;
+    this.readOnly = true;
 
     const promises = [];
 
@@ -1121,6 +1119,7 @@
 
   private handleDescriptionTextChanged(e: BindValueChangeEvent) {
     if (!this.repoConfig || this.loading) return;
+    if (this.repoConfig.description === e.detail.value) return;
     this.repoConfig = {
       ...this.repoConfig,
       description: e.detail.value,
@@ -1130,6 +1129,7 @@
 
   private handleStateSelectBindValueChanged(e: BindValueChangeEvent) {
     if (!this.repoConfig || this.loading) return;
+    if (this.repoConfig.state === e.detail.value) return;
     this.repoConfig = {
       ...this.repoConfig,
       state: e.detail.value as RepoState,
@@ -1139,6 +1139,7 @@
 
   private handleSubmitTypeSelectBindValueChanged(e: BindValueChangeEvent) {
     if (!this.repoConfig || this.loading) return;
+    if (this.repoConfig.submit_type === e.detail.value) return;
     this.repoConfig = {
       ...this.repoConfig,
       submit_type: e.detail.value as SubmitType,
diff --git a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo_test.ts b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo_test.ts
index c013c9e..4deb99a 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo_test.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo_test.ts
@@ -157,14 +157,17 @@
     element = await fixture(html`<gr-repo></gr-repo>`);
   });
 
-  test('render', () => {
+  test('render', async () => {
+    element.repo = REPO as RepoName;
+    await element.loadRepo();
+    await element.updateComplete;
     // prettier and shadowDom assert do not agree about span.title wrapping
     assert.shadowDom.equal(
       element,
       /* prettier-ignore */ /* HTML */ `
       <div class="gr-form-styles main read-only">
         <div class="info">
-          <h1 class="heading-1" id="Title"></h1>
+          <h1 class="heading-1" id="Title">test-repo</h1>
           <hr />
           <div>
             <a href="">
@@ -178,7 +181,7 @@
                 Browse
               </gr-button>
             </a>
-            <a href="">
+            <a href="/q/project:test-repo">
               <gr-button
                 aria-disabled="false"
                 link=""
@@ -190,15 +193,7 @@
             </a>
           </div>
         </div>
-        <div class="loading" id="loading">Loading...</div>
-        <div class="loading" id="loadedContent">
-          <div class="hide" id="downloadContent">
-            <h2 class="heading-2" id="download">Download</h2>
-            <fieldset>
-              <gr-download-commands id="downloadCommands">
-              </gr-download-commands>
-            </fieldset>
-          </div>
+        <div id="loadedContent">
           <h2 class="heading-2" id="configurations">Configurations</h2>
           <div id="form">
             <fieldset>
@@ -266,7 +261,7 @@
                   </span>
                 </section>
                 <section
-                  class="repositorySettings"
+                  class="repositorySettings showConfig"
                   id="enableSignedPushSettings"
                 >
                   <span class="title"> Enable signed push </span>
@@ -277,7 +272,7 @@
                   </span>
                 </section>
                 <section
-                  class="repositorySettings"
+                  class="repositorySettings showConfig"
                   id="requireSignedPushSettings"
                 >
                   <span class="title"> Require signed push </span>
@@ -379,9 +374,6 @@
                   </span>
                 </section>
               </fieldset>
-              <div class="hide pluginConfig">
-                <h3 class="heading-3">Plugins</h3>
-              </div>
               <gr-button
                 aria-disabled="true"
                 disabled=""
@@ -398,7 +390,51 @@
           </div>
         </div>
       </div>
-    `
+    `,
+      {ignoreTags: ['option']}
+    );
+  });
+
+  test('render loading', async () => {
+    element.repo = REPO as RepoName;
+    element.loading = true;
+    await element.updateComplete;
+    // prettier and shadowDom assert do not agree about span.title wrapping
+    assert.shadowDom.equal(
+      element,
+      /* prettier-ignore */ /* HTML */ `
+      <div class="gr-form-styles main read-only">
+        <div class="info">
+          <h1 class="heading-1" id="Title">test-repo</h1>
+          <hr />
+          <div>
+            <a href="">
+              <gr-button
+                aria-disabled="true"
+                disabled=""
+                link=""
+                role="button"
+                tabindex="-1"
+              >
+                Browse
+              </gr-button>
+            </a>
+            <a href="/q/project:test-repo">
+              <gr-button
+                aria-disabled="false"
+                link=""
+                role="button"
+                tabindex="0"
+              >
+                View Changes
+              </gr-button>
+            </a>
+          </div>
+        </div>
+        <div id="loading">Loading...</div>
+      </div>
+    `,
+      {ignoreTags: ['option']}
     );
   });
 
@@ -451,55 +487,22 @@
     assert.isTrue(requestUpdateStub.called);
   });
 
-  test('loading displays before repo config is loaded', () => {
-    assert.isTrue(
-      queryAndAssert<HTMLDivElement>(element, '#loading').classList.contains(
-        'loading'
-      )
-    );
-    assert.isFalse(
-      getComputedStyle(queryAndAssert<HTMLDivElement>(element, '#loading'))
-        .display === 'none'
-    );
-    assert.isTrue(
-      queryAndAssert<HTMLDivElement>(
-        element,
-        '#loadedContent'
-      ).classList.contains('loading')
-    );
-    assert.isTrue(
-      getComputedStyle(
-        queryAndAssert<HTMLDivElement>(element, '#loadedContent')
-      ).display === 'none'
-    );
-  });
-
-  test('download commands visibility', async () => {
-    element.loading = false;
-    await element.updateComplete;
-    assert.isTrue(
-      queryAndAssert<HTMLDivElement>(
-        element,
-        '#downloadContent'
-      ).classList.contains('hide')
-    );
-    assert.isTrue(
-      getComputedStyle(
-        queryAndAssert<HTMLDivElement>(element, '#downloadContent')
-      ).display === 'none'
-    );
+  test('render download commands', async () => {
+    element.repo = REPO as RepoName;
+    await element.loadRepo();
     element.schemesObj = SCHEMES;
     await element.updateComplete;
-    assert.isFalse(
-      queryAndAssert<HTMLDivElement>(
-        element,
-        '#downloadContent'
-      ).classList.contains('hide')
-    );
-    assert.isFalse(
-      getComputedStyle(
-        queryAndAssert<HTMLDivElement>(element, '#downloadContent')
-      ).display === 'none'
+    const content = queryAndAssert<HTMLDivElement>(element, '#downloadContent');
+    assert.dom.equal(
+      content,
+      /* HTML */ `
+        <div id="downloadContent">
+          <h2 class="heading-2" id="download">Download</h2>
+          <fieldset>
+            <gr-download-commands id="downloadCommands"></gr-download-commands>
+          </fieldset>
+        </div>
+      `
     );
   });
 
@@ -715,9 +718,9 @@
         Promise.resolve(new Response())
       );
 
-      const button = queryAll<GrButton>(element, 'gr-button')[2];
-
       await element.loadRepo();
+
+      const button = queryAll<GrButton>(element, 'gr-button')[2];
       assert.isTrue(button.hasAttribute('disabled'));
       assert.isFalse(
         queryAndAssert<HTMLHeadingElement>(
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
index faaee0b..d2ba2c9 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
@@ -6,7 +6,6 @@
 import '../gr-change-list/gr-change-list';
 import '../gr-repo-header/gr-repo-header';
 import '../gr-user-header/gr-user-header';
-import {page} from '../../../utils/page-wrapper-utils';
 import {
   AccountDetailInfo,
   AccountId,
@@ -28,6 +27,7 @@
 import {resolve} from '../../../models/dependency';
 import {subscribe} from '../../lit/subscription-controller';
 import {userModelToken} from '../../../models/user/user-model';
+import {navigationToken} from '../../core/gr-navigation/gr-navigation';
 
 const LIMIT_OPERATOR_PATTERN = /\blimit:(\d+)/i;
 
@@ -81,6 +81,8 @@
 
   private readonly getViewModel = resolve(this, searchViewModelToken);
 
+  private readonly getNavigation = resolve(this, navigationToken);
+
   constructor() {
     super();
     this.addEventListener('next-page', () => this.handleNextPage());
@@ -282,15 +284,13 @@
   // private but used in test
   handleNextPage() {
     if (!this.nextArrow || !this.changesPerPage) return;
-    // TODO: Use navigation service instead of `page.show()` directly.
-    page.show(this.computeNavLink(1));
+    this.getNavigation().setUrl(this.computeNavLink(1));
   }
 
   // private but used in test
   handlePreviousPage() {
     if (!this.prevArrow || !this.changesPerPage) return;
-    // TODO: Use navigation service instead of `page.show()` directly.
-    page.show(this.computeNavLink(-1));
+    this.getNavigation().setUrl(this.computeNavLink(-1));
   }
 
   // private but used in test
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view_test.ts b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view_test.ts
index f4bd8bd..decc253 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view_test.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view_test.ts
@@ -6,7 +6,6 @@
 import '../../../test/common-test-setup';
 import './gr-change-list-view';
 import {GrChangeListView} from './gr-change-list-view';
-import {page} from '../../../utils/page-wrapper-utils';
 import {query, queryAndAssert} from '../../../test/test-utils';
 import {createChange} from '../../../test/test-data-generators';
 import {ChangeInfo} from '../../../api/rest-api';
@@ -14,6 +13,8 @@
 import {GrChangeList} from '../gr-change-list/gr-change-list';
 import {GrChangeListSection} from '../gr-change-list-section/gr-change-list-section';
 import {GrChangeListItem} from '../gr-change-list-item/gr-change-list-item';
+import {testResolver} from '../../../test/common-test-setup';
+import {navigationToken} from '../../core/gr-navigation/gr-navigation';
 
 suite('gr-change-list-view tests', () => {
   let element: GrChangeListView;
@@ -158,7 +159,7 @@
   });
 
   test('handleNextPage', async () => {
-    const showStub = sinon.stub(page, 'show');
+    const setUrlStub = sinon.stub(testResolver(navigationToken), 'setUrl');
     element.changes = Array(25)
       .fill(0)
       .map(_ => createChange());
@@ -166,7 +167,7 @@
     element.loading = false;
     await element.updateComplete;
     element.handleNextPage();
-    assert.isFalse(showStub.called);
+    assert.isFalse(setUrlStub.called);
 
     element.changes = Array(25)
       .fill(0)
@@ -174,11 +175,11 @@
     element.loading = false;
     await element.updateComplete;
     element.handleNextPage();
-    assert.isTrue(showStub.called);
+    assert.isTrue(setUrlStub.called);
   });
 
   test('handlePreviousPage', async () => {
-    const showStub = sinon.stub(page, 'show');
+    const setUrlStub = sinon.stub(testResolver(navigationToken), 'setUrl');
     element.offset = 0;
     element.changes = Array(25)
       .fill(0)
@@ -187,11 +188,11 @@
     element.loading = false;
     await element.updateComplete;
     element.handlePreviousPage();
-    assert.isFalse(showStub.called);
+    assert.isFalse(setUrlStub.called);
 
     element.offset = 25;
     await element.updateComplete;
     element.handlePreviousPage();
-    assert.isTrue(showStub.called);
+    assert.isTrue(setUrlStub.called);
   });
 });
diff --git a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
index 84bdffb..b726292 100644
--- a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
@@ -55,7 +55,6 @@
 
 import {SummaryChipStyles} from './gr-summary-chip';
 import {when} from 'lit/directives/when.js';
-import {KnownExperimentId} from '../../../services/flags/flags';
 import {combineLatest} from 'rxjs';
 import {userModelToken} from '../../../models/user/user-model';
 
@@ -120,8 +119,6 @@
 
   private readonly reporting = getAppContext().reportingService;
 
-  private readonly flagsService = getAppContext().flagsService;
-
   constructor() {
     super();
     subscribe(
@@ -174,24 +171,22 @@
       () => this.getUserModel().account$,
       x => (this.selfAccount = x)
     );
-    if (this.flagsService.isEnabled(KnownExperimentId.MENTION_USERS)) {
-      subscribe(
-        this,
-        () =>
-          combineLatest([
-            this.getUserModel().account$,
-            this.getCommentsModel().threads$,
-          ]),
-        ([selfAccount, threads]) => {
-          if (!selfAccount || !selfAccount.email) return;
-          const unresolvedThreadsMentioningSelf = getMentionedThreads(
-            threads,
-            selfAccount
-          ).filter(isUnresolved);
-          this.mentionCount = unresolvedThreadsMentioningSelf.length;
-        }
-      );
-    }
+    subscribe(
+      this,
+      () =>
+        combineLatest([
+          this.getUserModel().account$,
+          this.getCommentsModel().threads$,
+        ]),
+      ([selfAccount, threads]) => {
+        if (!selfAccount || !selfAccount.email) return;
+        const unresolvedThreadsMentioningSelf = getMentionedThreads(
+          threads,
+          selfAccount
+        ).filter(isUnresolved);
+        this.mentionCount = unresolvedThreadsMentioningSelf.length;
+      }
+    );
   }
 
   static override get styles() {
@@ -575,8 +570,6 @@
   }
 
   private renderMentionChip() {
-    if (!this.flagsService.isEnabled(KnownExperimentId.MENTION_USERS))
-      return nothing;
     if (!this.mentionCount) return nothing;
     return html` <gr-summary-chip
       class="mentionSummary"
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
index 6c1b681..d4627e2 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
@@ -2079,9 +2079,7 @@
 
   // Private but used in tests.
   viewStateChanged() {
-    // viewState is set by gr-router in handleChangeRoute method and is never
-    // set to undefined
-    assertIsDefined(this.viewState, 'viewState');
+    if (!this.viewState) return;
 
     if (this.isChangeObsolete()) {
       // Tell the app element that we are not going to handle the new change
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
index b0dbda5..6f8bd9a 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
@@ -71,6 +71,9 @@
   text = '';
 
   @state()
+  shouldRebaseChain = false;
+
+  @state()
   private query: AutocompleteQuery;
 
   @state()
@@ -184,7 +187,7 @@
             />
             <label id="rebaseOnTipLabel" for="rebaseOnTipInput">
               Rebase on top of the ${this.branch} branch<span
-                ?hidden=${!this.hasParent}
+                ?hidden=${!this.hasParent || this.shouldRebaseChain}
               >
                 (breaks relation chain)
               </span>
@@ -206,7 +209,9 @@
             />
             <label id="rebaseOnOtherLabel" for="rebaseOnOtherInput">
               Rebase on a specific change, ref, or commit
-              <span ?hidden=${!this.hasParent}> (breaks relation chain) </span>
+              <span ?hidden=${!this.hasParent || this.shouldRebaseChain}>
+                (breaks relation chain)
+              </span>
             </label>
           </div>
           <div class="parentRevisionContainer">
@@ -230,10 +235,17 @@
             >
           </div>
           ${when(
-            this.flagsService.isEnabled(KnownExperimentId.REBASE_CHAIN),
+            this.flagsService.isEnabled(KnownExperimentId.REBASE_CHAIN) &&
+              this.hasParent,
             () =>
               html`<div>
-                <input id="rebaseChain" type="checkbox" />
+                <input
+                  id="rebaseChain"
+                  type="checkbox"
+                  @change=${() => {
+                    this.shouldRebaseChain = !!this.rebaseChain?.checked;
+                  }}
+                />
                 <label for="rebaseChain">Rebase all ancestors</label>
               </div>`
           )}
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
index d4cff78..218594b 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
@@ -121,7 +121,6 @@
 import {subscribe} from '../../lit/subscription-controller';
 import {configModelToken} from '../../../models/config/config-model';
 import {hasHumanReviewer, isOwner} from '../../../utils/change-util';
-import {KnownExperimentId} from '../../../services/flags/flags';
 import {commentsModelToken} from '../../../models/comments/comments-model';
 import {
   CommentEditingChangedDetail,
@@ -384,8 +383,6 @@
   private readonly restApiService: RestApiService =
     getAppContext().restApiService;
 
-  private readonly flagsService = getAppContext().flagsService;
-
   private readonly getPluginLoader = resolve(this, pluginLoaderToken);
 
   private readonly getConfigModel = resolve(this, configModelToken);
@@ -671,9 +668,6 @@
       this,
       () => this.getCommentsModel().mentionedUsersInUnresolvedDrafts$,
       x => {
-        if (!this.flagsService.isEnabled(KnownExperimentId.MENTION_USERS)) {
-          return;
-        }
         this.mentionedUsersInUnresolvedDrafts = x.filter(
           v => !this.isAlreadyReviewerOrCC(v)
         );
@@ -1441,18 +1435,13 @@
     ).filter(isDefined);
 
     for (const user of newAttentionSetUsers) {
-      let reason;
-      if (this.flagsService.isEnabled(KnownExperimentId.MENTION_USERS)) {
-        reason =
-          getMentionedReason(
-            this.draftCommentThreads,
-            this.account,
-            user,
-            this.serverConfig
-          ) ?? '';
-      } else {
-        reason = getReplyByReason(this.account, this.serverConfig);
-      }
+      const reason =
+        getMentionedReason(
+          this.draftCommentThreads,
+          this.account,
+          user,
+          this.serverConfig
+        ) ?? '';
       reviewInput.add_to_attention_set.push({user: getUserId(user), reason});
     }
     reviewInput.remove_from_attention_set = [];
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.ts
index 12b1c40..f7b3aec 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.ts
@@ -13,7 +13,6 @@
   query,
   queryAll,
   queryAndAssert,
-  stubFlags,
   stubRestApi,
   waitUntilVisible,
 } from '../../../test/test-utils';
@@ -59,7 +58,6 @@
 import {accountKey} from '../../../utils/account-util';
 import {GrButton} from '../../shared/gr-button/gr-button';
 import {GrAccountLabel} from '../../shared/gr-account-label/gr-account-label';
-import {KnownExperimentId} from '../../../services/flags/flags';
 import {Key, Modifier} from '../../../utils/dom-util';
 import {GrComment} from '../../shared/gr-comment/gr-comment';
 import {testResolver} from '../../../test/common-test-setup';
@@ -2527,9 +2525,6 @@
 
   suite('mention users', () => {
     setup(async () => {
-      stubFlags('isEnabled')
-        .withArgs(KnownExperimentId.MENTION_USERS)
-        .returns(true);
       element.account = createAccountWithId(1);
       element.requestUpdate();
       await element.updateComplete;
diff --git a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts
index 80a1a9a..c09d2a2 100644
--- a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts
+++ b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts
@@ -42,7 +42,6 @@
 import {resolve} from '../../../models/dependency';
 import {changeModelToken} from '../../../models/change/change-model';
 import {Interaction} from '../../../constants/reporting';
-import {KnownExperimentId} from '../../../services/flags/flags';
 import {HtmlPatched} from '../../../utils/lit-util';
 import {userModelToken} from '../../../models/user/user-model';
 import {specialFilePathCompare} from '../../../utils/path-list-util';
@@ -205,8 +204,6 @@
 
   private readonly reporting = getAppContext().reportingService;
 
-  private readonly flagsService = getAppContext().flagsService;
-
   private readonly getUserModel = resolve(this, userModelToken);
 
   private readonly patched = new HtmlPatched(key => {
@@ -495,14 +492,10 @@
       value: CommentTabState.UNRESOLVED,
     });
     if (this.account) {
-      if (this.flagsService.isEnabled(KnownExperimentId.MENTION_USERS)) {
-        items.push({
-          text: `Mentions (${
-            getMentionedThreads(threads, this.account).length
-          })`,
-          value: CommentTabState.MENTIONS,
-        });
-      }
+      items.push({
+        text: `Mentions (${getMentionedThreads(threads, this.account).length})`,
+        value: CommentTabState.MENTIONS,
+      });
       items.push({
         text: `Drafts (${threads.filter(isDraftThread).length})`,
         value: CommentTabState.DRAFTS,
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
index bcf6937..fac7a83 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
@@ -49,6 +49,7 @@
   AdminChildView,
   AdminViewModel,
   AdminViewState,
+  PLUGIN_LIST_ROUTE,
 } from '../../../models/views/admin';
 import {
   AgreementViewModel,
@@ -99,6 +100,8 @@
   isInBaseOfPatchRange,
 } from '../../../utils/comment-util';
 import {isFileUnchanged} from '../../../embed/diff/gr-diff/gr-diff-utils';
+import {Route, ViewState} from '../../../models/views/base';
+import {Model} from '../../../models/model';
 
 const RoutePattern = {
   ROOT: '/',
@@ -184,8 +187,6 @@
 
   PLUGINS: /^\/plugins\/(.+)$/,
 
-  PLUGIN_LIST: /^\/admin\/plugins(\/)?$/,
-
   // Matches /admin/plugins[,<offset>][/].
   PLUGIN_LIST_OFFSET: /^\/admin\/plugins(,(\d+))?(\/)?$/,
   PLUGIN_LIST_FILTER: '/admin/plugins/q/filter::filter',
@@ -369,6 +370,7 @@
   }
 
   setState(state: AppElementParams) {
+    // TODO: Move this logic into the change model.
     if ('repo' in state && state.repo !== undefined && 'changeNum' in state)
       this.restApiService.setInProjectLookup(state.changeNum, state.repo);
 
@@ -488,6 +490,9 @@
    * route is matched, the handler will be executed with `this` referring
    * to the component. Its return value will be discarded so that it does
    * not interfere with page.js.
+   * TODO: Get rid of this parameter. This is really not something that the
+   * router wants to be concerned with. The reporting service and the view
+   * models should figure that out between themselves.
    * @param authRedirect If true, then auth is checked before
    * executing the handler. If the user is not logged in, it will redirect
    * to the login flow and the handler will not be executed. The login
@@ -515,6 +520,32 @@
   }
 
   /**
+   * Convenience wrapper of `mapRoute()` for when you have a `Route` object that
+   * can deal with state creation. Takes care of setting the view model state,
+   * which is currently duplicated lots of times for direct callers of
+   * `mapRoute()`.
+   */
+  mapRouteState<T extends ViewState>(
+    route: Route<T>,
+    viewModel: Model<T | undefined>,
+    handlerName: string,
+    authRedirect?: boolean
+  ) {
+    const handler = (ctx: PageContext) => {
+      const state = route.createState(ctx);
+      // Note that order is important: `this.setState()` must be called before
+      // `viewModel.setState()`. Otherwise the chain of model subscriptions
+      // would be very different. Some views may want app element to swap the
+      // top level view first. Also, `this.setState()` has some special change
+      // view model resetting logic. Eventually the order might not be important
+      // anymore, but be careful! :-)
+      this.setState(state as AppElementParams);
+      viewModel.setState(state);
+    };
+    this.mapRoute(route.urlPattern, handlerName, handler, authRedirect);
+  }
+
+  /**
    * This is similar to letting the browser navigate to this URL when the user
    * clicks it, or to just setting `window.location.href` directly.
    *
@@ -814,10 +845,10 @@
       true
     );
 
-    this.mapRoute(
-      RoutePattern.PLUGIN_LIST,
+    this.mapRouteState(
+      PLUGIN_LIST_ROUTE,
+      this.adminViewModel,
       'handlePluginListRoute',
-      ctx => this.handlePluginListRoute(ctx),
       true
     );
 
@@ -1399,16 +1430,6 @@
     this.adminViewModel.setState(state);
   }
 
-  handlePluginListRoute(_: PageContext) {
-    const state: AdminViewState = {
-      view: GerritView.ADMIN,
-      adminView: AdminChildView.PLUGINS,
-    };
-    // Note that router model view must be updated before view models.
-    this.setState(state);
-    this.adminViewModel.setState(state);
-  }
-
   handleQueryRoute(ctx: PageContext) {
     const state: Partial<SearchViewState> = {
       view: GerritView.SEARCH,
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
index d8761bf..112c776 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
@@ -1065,14 +1065,6 @@
           filter: 'foo',
         });
       });
-
-      test('handlePluginListRoute', () => {
-        const ctx = createPageContext();
-        assertctxToParams(ctx, 'handlePluginListRoute', {
-          view: GerritView.ADMIN,
-          adminView: AdminChildView.PLUGINS,
-        });
-      });
     });
 
     suite('change/diff routes', () => {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
index de92b16..23dce97 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
@@ -347,9 +347,7 @@
     );
     this.renderPrefs = {
       ...this.renderPrefs,
-      use_lit_components: this.flags.isEnabled(
-        KnownExperimentId.DIFF_RENDERING_LIT
-      ),
+      use_lit_components: true,
     };
     this.addEventListener(
       // These are named inconsistently for a reason:
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
index e9da5b6..c74993f 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
@@ -732,7 +732,7 @@
       changedProperties.has('focusLineNum') ||
       changedProperties.has('leftSide')
     ) {
-      this.initLineOfInterestAndCursor();
+      this.initCursor();
     }
     if (
       changedProperties.has('change') ||
@@ -774,6 +774,7 @@
         .change=${this.change}
         .patchRange=${this.patchRange}
         .file=${file}
+        .lineOfInterest=${this.getLineOfInterest()}
         .path=${this.path}
         .projectName=${this.change?.project}
         @is-blame-loaded-changed=${this.onIsBlameLoadedChanged}
@@ -1350,13 +1351,6 @@
     return {path: fileList[idx]};
   }
 
-  // Private but used in tests.
-  initLineOfInterestAndCursor() {
-    if (!this.diffHost) return;
-    this.diffHost.lineOfInterest = this.getLineOfInterest();
-    this.initCursor();
-  }
-
   private updateUrlToDiffUrl(lineNum?: number, leftSide?: boolean) {
     if (!this.change) return;
     if (!this.patchNum) return;
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.ts b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.ts
index 9bbe4b3..889e9dd 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.ts
@@ -1315,7 +1315,7 @@
     test('hash is determined from viewState', async () => {
       assertIsDefined(element.diffHost);
       sinon.stub(element.diffHost, 'reload');
-      const initLineStub = sinon.stub(element, 'initLineOfInterestAndCursor');
+      const initLineStub = sinon.stub(element, 'initCursor');
 
       element.focusLineNum = 123;
 
@@ -1819,7 +1819,7 @@
 
     test('File change should trigger setUrl once', async () => {
       element.files = getFilesFromFileList(['file1', 'file2', 'file3']);
-      sinon.stub(element, 'initLineOfInterestAndCursor');
+      sinon.stub(element, 'initCursor');
 
       // Load file1
       viewModel.setState({
diff --git a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_test.ts b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_test.ts
index 0092193..ea5e9f3 100644
--- a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_test.ts
+++ b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_test.ts
@@ -6,10 +6,11 @@
 import '../../../test/common-test-setup';
 import './gr-documentation-search';
 import {GrDocumentationSearch} from './gr-documentation-search';
-import {page} from '../../../utils/page-wrapper-utils';
 import {queryAndAssert, stubRestApi} from '../../../test/test-utils';
 import {DocResult} from '../../../types/common';
 import {fixture, html, assert} from '@open-wc/testing';
+import {testResolver} from '../../../test/common-test-setup';
+import {navigationToken} from '../../core/gr-navigation/gr-navigation';
 
 function documentationGenerator(counter: number) {
   return {
@@ -31,7 +32,7 @@
   let documentationSearches: DocResult[];
 
   setup(async () => {
-    sinon.stub(page, 'show');
+    sinon.stub(testResolver(navigationToken), 'setUrl');
     element = await fixture(
       html`<gr-documentation-search></gr-documentation-search>`
     );
diff --git a/polygerrit-ui/app/elements/gr-app-types.ts b/polygerrit-ui/app/elements/gr-app-types.ts
index 0261992..68e7309 100644
--- a/polygerrit-ui/app/elements/gr-app-types.ts
+++ b/polygerrit-ui/app/elements/gr-app-types.ts
@@ -28,6 +28,7 @@
   justRegistered: boolean;
 }
 
+// TODO: Get rid of this type. <gr-app-element> needs to be refactored for that.
 export type AppElementParams =
   | DashboardViewState
   | GroupViewState
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
index 66beaf1..c1cc863 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
@@ -275,9 +275,7 @@
         this.save();
       });
     }
-    if (this.flagsService.isEnabled(KnownExperimentId.MENTION_USERS)) {
-      this.messagePlaceholder = 'Mention others with @';
-    }
+    this.messagePlaceholder = 'Mention others with @';
     subscribe(
       this,
       () => this.getUserModel().account$,
diff --git a/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.ts b/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.ts
index 627ea27..45eca40 100644
--- a/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.ts
+++ b/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.ts
@@ -18,8 +18,6 @@
 import {CommentLinks, EmailAddress} from '../../../api/rest-api';
 import {linkifyUrlsAndApplyRewrite} from '../../../utils/link-util';
 import '../gr-account-chip/gr-account-chip';
-import {KnownExperimentId} from '../../../services/flags/flags';
-import {getAppContext} from '../../../services/app-context';
 
 /**
  * This element optionally renders markdown and also applies some regex
@@ -36,8 +34,6 @@
   @state()
   private repoCommentLinks: CommentLinks = {};
 
-  private readonly flagsService = getAppContext().flagsService;
-
   private readonly getConfigModel = resolve(this, configModelToken);
 
   // Private const but used in tests.
@@ -214,9 +210,7 @@
 
   override updated() {
     // Look for @mentions and replace them with an account-label chip.
-    if (this.flagsService.isEnabled(KnownExperimentId.MENTION_USERS)) {
-      this.convertEmailsToAccountChips();
-    }
+    this.convertEmailsToAccountChips();
   }
 
   private convertEmailsToAccountChips() {
diff --git a/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text_test.ts b/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text_test.ts
index 3881c62..3187ada 100644
--- a/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text_test.ts
+++ b/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text_test.ts
@@ -15,14 +15,9 @@
 import './gr-formatted-text';
 import {GrFormattedText} from './gr-formatted-text';
 import {createConfig} from '../../../test/test-data-generators';
-import {
-  queryAndAssert,
-  stubFlags,
-  waitUntilObserved,
-} from '../../../test/test-utils';
+import {queryAndAssert, waitUntilObserved} from '../../../test/test-utils';
 import {CommentLinks, EmailAddress} from '../../../api/rest-api';
 import {testResolver} from '../../../test/common-test-setup';
-import {KnownExperimentId} from '../../../services/flags/flags';
 import {GrAccountChip} from '../gr-account-chip/gr-account-chip';
 
 suite('gr-formatted-text tests', () => {
@@ -412,38 +407,7 @@
       );
     });
 
-    test('does not handle @mentions if not enabled', async () => {
-      stubFlags('isEnabled')
-        .withArgs(KnownExperimentId.MENTION_USERS)
-        .returns(false);
-      element.content = '@someone@google.com';
-      await element.updateComplete;
-
-      assert.shadowDom.equal(
-        element,
-        /* HTML */ `
-          <marked-element>
-            <div slot="markdown-html" class="markdown-html">
-              <p>
-                @
-                <a
-                  href="mailto:someone@google.com"
-                  rel="noopener"
-                  target="_blank"
-                >
-                  someone@google.com
-                </a>
-              </p>
-            </div>
-          </marked-element>
-        `
-      );
-    });
-
-    test('handles @mentions if enabled', async () => {
-      stubFlags('isEnabled')
-        .withArgs(KnownExperimentId.MENTION_USERS)
-        .returns(true);
+    test('handles @mentions', async () => {
       element.content = '@someone@google.com';
       await element.updateComplete;
 
@@ -470,9 +434,6 @@
     });
 
     test('does not handle @mentions that is part of a code block', async () => {
-      stubFlags('isEnabled')
-        .withArgs(KnownExperimentId.MENTION_USERS)
-        .returns(true);
       element.content = '`@`someone@google.com';
       await element.updateComplete;
 
diff --git a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
index 449c041..f5837e3 100644
--- a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
+++ b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
@@ -7,13 +7,14 @@
 import '../gr-button/gr-button';
 import '../gr-icon/gr-icon';
 import {encodeURL, getBaseUrl} from '../../../utils/url-util';
-import {page} from '../../../utils/page-wrapper-utils';
 import {fireEvent} from '../../../utils/event-util';
 import {debounce, DelayedTask} from '../../../utils/async-util';
 import {sharedStyles} from '../../../styles/shared-styles';
 import {LitElement, PropertyValues, css, html} from 'lit';
 import {customElement, property} from 'lit/decorators.js';
 import {BindValueChangeEvent} from '../../../types/events';
+import {resolve} from '../../../models/dependency';
+import {navigationToken} from '../../core/gr-navigation/gr-navigation';
 
 const REQUEST_DEBOUNCE_INTERVAL_MS = 200;
 
@@ -48,6 +49,8 @@
 
   private reloadTask?: DelayedTask;
 
+  private readonly getNavigation = resolve(this, navigationToken);
+
   override disconnectedCallback() {
     this.reloadTask?.cancel();
     super.disconnectedCallback();
@@ -121,30 +124,18 @@
       </div>
       <slot></slot>
       <nav>
-        Page ${this.computePage(this.offset, this.itemsPerPage)}
+        Page ${this.computePage()}
         <a
           id="prevArrow"
-          href=${this.computeNavLink(
-            this.offset,
-            -1,
-            this.itemsPerPage,
-            this.filter,
-            this.path
-          )}
+          href=${this.computeNavLink(-1)}
           ?hidden=${this.loading || this.offset === 0}
         >
           <gr-icon icon="chevron_left"></gr-icon>
         </a>
         <a
           id="nextArrow"
-          href=${this.computeNavLink(
-            this.offset,
-            1,
-            this.itemsPerPage,
-            this.filter,
-            this.path
-          )}
-          ?hidden=${this.hideNextArrow(this.loading, this.items)}
+          href=${this.computeNavLink(1)}
+          ?hidden=${this.hideNextArrow()}
         >
           <gr-icon icon="chevron_right"></gr-icon>
         </a>
@@ -177,12 +168,12 @@
       () => {
         if (!this.isConnected || !this.path) return;
         if (filter) {
-          // TODO: Use navigation service instead of `page.show()` directly.
-          page.show(`${this.path}/q/filter:${encodeURL(filter, false)}`);
+          this.getNavigation().setUrl(
+            `${this.path}/q/filter:${encodeURL(filter, false)}`
+          );
           return;
         }
-        // TODO: Use navigation service instead of `page.show()` directly.
-        page.show(this.path);
+        this.getNavigation().setUrl(this.path);
       },
       REQUEST_DEBOUNCE_INTERVAL_MS
     );
@@ -193,19 +184,13 @@
   }
 
   // private but used in test
-  computeNavLink(
-    offset: number,
-    direction: number,
-    itemsPerPage: number,
-    filter: string | undefined,
-    path = ''
-  ) {
+  computeNavLink(direction: number) {
     // Offset could be a string when passed from the router.
-    offset = +(offset || 0);
-    const newOffset = Math.max(0, offset + itemsPerPage * direction);
-    let href = getBaseUrl() + path;
-    if (filter) {
-      href += '/q/filter:' + encodeURL(filter, false);
+    const offset = +(this.offset || 0);
+    const newOffset = Math.max(0, offset + this.itemsPerPage * direction);
+    let href = getBaseUrl() + (this.path ?? '');
+    if (this.filter) {
+      href += '/q/filter:' + encodeURL(this.filter, false);
     }
     if (newOffset > 0) {
       href += `,${newOffset}`;
@@ -214,11 +199,9 @@
   }
 
   // private but used in test
-  hideNextArrow(loading?: boolean, items?: unknown[]) {
-    if (loading || !items || !items.length) {
-      return true;
-    }
-    const lastPage = items.length < this.itemsPerPage + 1;
+  hideNextArrow() {
+    if (this.loading || !this.items?.length) return true;
+    const lastPage = this.items.length < this.itemsPerPage + 1;
     return lastPage;
   }
 
@@ -226,8 +209,8 @@
   // to either support a decimal or make it go to the nearest
   // whole number (e.g 3).
   // private but used in test
-  computePage(offset: number, itemsPerPage: number) {
-    return offset / itemsPerPage + 1;
+  computePage() {
+    return this.offset / this.itemsPerPage + 1;
   }
 
   private handleFilterBindValueChanged(e: BindValueChangeEvent) {
diff --git a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view_test.ts b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view_test.ts
index bbbef72..ecc1c25 100644
--- a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view_test.ts
+++ b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view_test.ts
@@ -6,10 +6,11 @@
 import '../../../test/common-test-setup';
 import './gr-list-view';
 import {GrListView} from './gr-list-view';
-import {page} from '../../../utils/page-wrapper-utils';
 import {queryAndAssert, stubBaseUrl} from '../../../test/test-utils';
 import {GrButton} from '../gr-button/gr-button';
 import {fixture, html, assert} from '@open-wc/testing';
+import {testResolver} from '../../../test/common-test-setup';
+import {navigationToken} from '../../core/gr-navigation/gr-navigation';
 
 suite('gr-list-view tests', () => {
   let element: GrListView;
@@ -57,36 +58,25 @@
   });
 
   test('computeNavLink', () => {
-    const offset = 25;
-    const projectsPerPage = 25;
-    let filter = 'test';
-    const path = '/admin/projects';
+    element.offset = 25;
+    element.itemsPerPage = 25;
+    element.filter = 'test';
+    element.path = '/admin/projects';
 
     stubBaseUrl('');
 
-    assert.equal(
-      element.computeNavLink(offset, 1, projectsPerPage, filter, path),
-      '/admin/projects/q/filter:test,50'
-    );
+    assert.equal(element.computeNavLink(1), '/admin/projects/q/filter:test,50');
 
-    assert.equal(
-      element.computeNavLink(offset, -1, projectsPerPage, filter, path),
-      '/admin/projects/q/filter:test'
-    );
+    assert.equal(element.computeNavLink(-1), '/admin/projects/q/filter:test');
 
-    assert.equal(
-      element.computeNavLink(offset, 1, projectsPerPage, undefined, path),
-      '/admin/projects,50'
-    );
+    element.filter = undefined;
+    assert.equal(element.computeNavLink(1), '/admin/projects,50');
 
-    assert.equal(
-      element.computeNavLink(offset, -1, projectsPerPage, undefined, path),
-      '/admin/projects'
-    );
+    assert.equal(element.computeNavLink(-1), '/admin/projects');
 
-    filter = 'plugins/';
+    element.filter = 'plugins/';
     assert.equal(
-      element.computeNavLink(offset, 1, projectsPerPage, filter, path),
+      element.computeNavLink(1),
       '/admin/projects/q/filter:plugins%252F,50'
     );
   });
@@ -95,7 +85,9 @@
     let resolve: (url: string) => void;
     const promise = new Promise(r => (resolve = r));
     element.path = '/admin/projects';
-    sinon.stub(page, 'show').callsFake(r => resolve(r));
+    sinon
+      .stub(testResolver(navigationToken), 'setUrl')
+      .callsFake(r => resolve(r));
 
     element.filter = 'test';
     await element.updateComplete;
@@ -113,19 +105,19 @@
 
   test('next button', async () => {
     element.itemsPerPage = 25;
-    let projects = new Array(26);
+    element.items = new Array(26);
+    element.loading = false;
     await element.updateComplete;
 
-    let loading;
-    assert.isFalse(element.hideNextArrow(loading, projects));
-    loading = true;
-    assert.isTrue(element.hideNextArrow(loading, projects));
-    loading = false;
-    assert.isFalse(element.hideNextArrow(loading, projects));
-    projects = [];
-    assert.isTrue(element.hideNextArrow(loading, projects));
-    projects = new Array(4);
-    assert.isTrue(element.hideNextArrow(loading, projects));
+    assert.isFalse(element.hideNextArrow());
+    element.loading = true;
+    assert.isTrue(element.hideNextArrow());
+    element.loading = false;
+    assert.isFalse(element.hideNextArrow());
+    element.items = [];
+    assert.isTrue(element.hideNextArrow());
+    element.items = new Array(4);
+    assert.isTrue(element.hideNextArrow());
   });
 
   test('prev button', async () => {
@@ -186,20 +178,40 @@
   test('next/prev links change when path changes', async () => {
     const BRANCHES_PATH = '/path/to/branches';
     const TAGS_PATH = '/path/to/tags';
-    const computeNavLinkStub = sinon.stub(element, 'computeNavLink');
     element.offset = 0;
     element.itemsPerPage = 25;
     element.filter = '';
     element.path = BRANCHES_PATH;
     await element.updateComplete;
-    assert.equal(computeNavLinkStub.lastCall.args[4], BRANCHES_PATH);
+
+    assert.dom.equal(
+      queryAndAssert(element, 'nav a'),
+      /* HTML */ `
+        <a hidden="" href="${BRANCHES_PATH}" id="prevArrow">
+          <gr-icon icon="chevron_left"> </gr-icon>
+        </a>
+      `
+    );
+
     element.path = TAGS_PATH;
     await element.updateComplete;
-    assert.equal(computeNavLinkStub.lastCall.args[4], TAGS_PATH);
+
+    assert.dom.equal(
+      queryAndAssert(element, 'nav a'),
+      /* HTML */ `
+        <a hidden="" href="${TAGS_PATH}" id="prevArrow">
+          <gr-icon icon="chevron_left"> </gr-icon>
+        </a>
+      `
+    );
   });
 
   test('computePage', () => {
-    assert.equal(element.computePage(0, 25), 1);
-    assert.equal(element.computePage(50, 25), 3);
+    element.offset = 0;
+    element.itemsPerPage = 25;
+    assert.equal(element.computePage(), 1);
+    element.offset = 50;
+    element.itemsPerPage = 25;
+    assert.equal(element.computePage(), 3);
   });
 });
diff --git a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.ts b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.ts
index a1a1e84..e1e4ca5 100644
--- a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.ts
+++ b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.ts
@@ -17,12 +17,11 @@
 import {Key} from '../../../utils/dom-util';
 import {ValueChangedEvent} from '../../../types/events';
 import {fire} from '../../../utils/event-util';
-import {LitElement, css, html, nothing} from 'lit';
+import {LitElement, css, html} from 'lit';
 import {customElement, property, query, state} from 'lit/decorators.js';
 import {sharedStyles} from '../../../styles/shared-styles';
 import {PropertyValues} from 'lit';
 import {classMap} from 'lit/directives/class-map.js';
-import {KnownExperimentId} from '../../../services/flags/flags';
 import {NumericChangeId, ServerInfo} from '../../../api/rest-api';
 import {subscribe} from '../../lit/subscription-controller';
 import {resolve} from '../../../models/dependency';
@@ -115,8 +114,6 @@
 
   private readonly getChangeModel = resolve(this, changeModelToken);
 
-  private readonly flagsService = getAppContext().flagsService;
-
   private readonly restApiService = getAppContext().restApiService;
 
   private readonly getConfigModel = resolve(this, configModelToken);
@@ -265,8 +262,6 @@
   }
 
   private renderMentionsDropdown() {
-    if (!this.flagsService.isEnabled(KnownExperimentId.MENTION_USERS))
-      return nothing;
     return html` <gr-autocomplete-dropdown
       id="mentionsSuggestions"
       .suggestions=${this.suggestions}
@@ -524,8 +519,6 @@
   }
 
   private isMentionsDropdownActive() {
-    if (!this.flagsService.isEnabled(KnownExperimentId.MENTION_USERS))
-      return false;
     return (
       this.specialCharIndex !== -1 && this.text[this.specialCharIndex] === '@'
     );
@@ -540,10 +533,8 @@
   private computeSpecialCharIndex() {
     const charAtCursor = this.text[this.textarea!.selectionStart - 1];
 
-    if (this.flagsService.isEnabled(KnownExperimentId.MENTION_USERS)) {
-      if (charAtCursor === '@' && this.specialCharIndex === -1) {
-        this.specialCharIndex = this.getSpecialCharIndex(this.text);
-      }
+    if (charAtCursor === '@' && this.specialCharIndex === -1) {
+      this.specialCharIndex = this.getSpecialCharIndex(this.text);
     }
     if (charAtCursor === ':' && this.specialCharIndex === -1) {
       this.specialCharIndex = this.getSpecialCharIndex(this.text);
diff --git a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_test.ts b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_test.ts
index f8ae38c..0400e85 100644
--- a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_test.ts
+++ b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_test.ts
@@ -7,12 +7,7 @@
 import './gr-textarea';
 import {GrTextarea} from './gr-textarea';
 import {ItemSelectedEvent} from '../gr-autocomplete-dropdown/gr-autocomplete-dropdown';
-import {
-  pressKey,
-  stubFlags,
-  stubRestApi,
-  waitUntil,
-} from '../../../test/test-utils';
+import {pressKey, stubRestApi, waitUntil} from '../../../test/test-utils';
 import {fixture, html, assert} from '@open-wc/testing';
 import {createAccountWithEmail} from '../../../test/test-data-generators';
 import {Key} from '../../../utils/dom-util';
@@ -31,14 +26,16 @@
       element,
       /* HTML */ `<div id="hiddenText"></div>
         <span id="caratSpan"> </span>
+        <gr-autocomplete-dropdown id="emojiSuggestions" is-hidden="">
+        </gr-autocomplete-dropdown>
         <gr-autocomplete-dropdown
-          id="emojiSuggestions"
+          id="mentionsSuggestions"
           is-hidden=""
-          style="position: fixed; top: 150px; left: 392.5px; box-sizing: border-box; max-height: 300px; max-width: 785px;"
+          role="listbox"
         >
         </gr-autocomplete-dropdown>
         <iron-autogrow-textarea aria-disabled="false" focused="" id="textarea">
-        </iron-autogrow-textarea> `,
+        </iron-autogrow-textarea>`,
       {
         // gr-autocomplete-dropdown sizing seems to vary between local & CI
         ignoreAttributes: [
@@ -49,47 +46,6 @@
   });
 
   suite('mention users', () => {
-    setup(async () => {
-      stubFlags('isEnabled').returns(true);
-      element.requestUpdate();
-      await element.updateComplete;
-    });
-
-    test('renders', () => {
-      assert.shadowDom.equal(
-        element,
-        /* HTML */ `
-          <div id="hiddenText"></div>
-          <span id="caratSpan"> </span>
-          <gr-autocomplete-dropdown
-            id="emojiSuggestions"
-            is-hidden=""
-            style="position: fixed; top: 478px; left: 321px; box-sizing: border-box; max-height: 956px; max-width: 642px;"
-          >
-          </gr-autocomplete-dropdown>
-          <gr-autocomplete-dropdown
-            id="mentionsSuggestions"
-            is-hidden=""
-            role="listbox"
-            style="position: fixed; top: 478px; left: 321px; box-sizing: border-box; max-height: 956px; max-width: 642px;"
-          >
-          </gr-autocomplete-dropdown>
-          <iron-autogrow-textarea
-            focused=""
-            aria-disabled="false"
-            id="textarea"
-          >
-          </iron-autogrow-textarea>
-        `,
-        {
-          // gr-autocomplete-dropdown sizing seems to vary between local & CI
-          ignoreAttributes: [
-            {tags: ['gr-autocomplete-dropdown'], attributes: ['style']},
-          ],
-        }
-      );
-    });
-
     test('mentions selector is open when @ is typed & the textarea has focus', async () => {
       // Needed for Safari tests. selectionStart is not updated when text is
       // updated.
diff --git a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-section.ts b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-section.ts
index 28e83ae..b952a3d 100644
--- a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-section.ts
+++ b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-section.ts
@@ -76,6 +76,9 @@
 
     const pairs = this.getLinePairs();
     const responsiveMode = getResponsiveMode(this.diffPrefs, this.renderPrefs);
+    const hideFileCommentButton =
+      this.diffPrefs?.show_file_comment_button === false ||
+      this.renderPrefs?.show_file_comment_button === false;
     const body = html`
       <tbody class=${diffClasses(...extras)}>
         ${this.renderContextControls()} ${this.renderMoveControls()}
@@ -92,6 +95,7 @@
               .tabSize=${this.diffPrefs?.tab_size ?? 2}
               .unifiedDiff=${this.isUnifiedDiff()}
               .responsiveMode=${responsiveMode}
+              .hideFileCommentButton=${hideFileCommentButton}
             >
             </gr-diff-row>
           `;
diff --git a/polygerrit-ui/app/models/views/admin.ts b/polygerrit-ui/app/models/views/admin.ts
index 3380637..de9ec5d 100644
--- a/polygerrit-ui/app/models/views/admin.ts
+++ b/polygerrit-ui/app/models/views/admin.ts
@@ -7,7 +7,18 @@
 import {getBaseUrl} from '../../utils/url-util';
 import {define} from '../dependency';
 import {Model} from '../model';
-import {ViewState} from './base';
+import {Route, ViewState} from './base';
+
+export const PLUGIN_LIST_ROUTE: Route<AdminViewState> = {
+  urlPattern: /^\/admin\/plugins(\/)?$/,
+  createState: () => {
+    const state: AdminViewState = {
+      view: GerritView.ADMIN,
+      adminView: AdminChildView.PLUGINS,
+    };
+    return state;
+  },
+};
 
 export enum AdminChildView {
   REPOS = 'gr-repo-list',
diff --git a/polygerrit-ui/app/models/views/admin_test.ts b/polygerrit-ui/app/models/views/admin_test.ts
new file mode 100644
index 0000000..c9b7801
--- /dev/null
+++ b/polygerrit-ui/app/models/views/admin_test.ts
@@ -0,0 +1,29 @@
+/**
+ * @license
+ * Copyright 2022 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+import {assert} from '@open-wc/testing';
+import {GerritView} from '../../services/router/router-model';
+import '../../test/common-test-setup';
+import {AdminChildView, PLUGIN_LIST_ROUTE} from './admin';
+
+suite('admin view model', () => {
+  suite('routes', () => {
+    test('PLUGIN_LIST', () => {
+      const {urlPattern: pattern, createState} = PLUGIN_LIST_ROUTE;
+
+      assert.isTrue(pattern.test('/admin/plugins'));
+      assert.isTrue(pattern.test('/admin/plugins/'));
+      assert.isFalse(pattern.test('admin/plugins'));
+      assert.isFalse(pattern.test('//admin/plugins'));
+      assert.isFalse(pattern.test('//admin/plugins?'));
+      assert.isFalse(pattern.test('/admin/plugins//'));
+
+      assert.deepEqual(createState({}), {
+        view: GerritView.ADMIN,
+        adminView: AdminChildView.PLUGINS,
+      });
+    });
+  });
+});
diff --git a/polygerrit-ui/app/models/views/base.ts b/polygerrit-ui/app/models/views/base.ts
index 065495d..72bec33 100644
--- a/polygerrit-ui/app/models/views/base.ts
+++ b/polygerrit-ui/app/models/views/base.ts
@@ -8,3 +8,24 @@
 export interface ViewState {
   view: GerritView;
 }
+
+/**
+ * While we are using page.js this interface will normally be implemented by
+ * PageContext, but it helps testing and independence to have our own type
+ * here.
+ */
+export interface UrlInfo {
+  querystring?: string;
+  hash?: string;
+  /** What the regular expression matching returns. */
+  params?: {[paramIndex: string]: string};
+}
+
+/**
+ * Based on `urlPattern` knows whether a URL matches and if so, then
+ * `createState()` can produce a `ViewState` from the matched URL.
+ */
+export interface Route<T extends ViewState> {
+  urlPattern: RegExp;
+  createState: (info: UrlInfo) => T;
+}
diff --git a/polygerrit-ui/app/services/flags/flags.ts b/polygerrit-ui/app/services/flags/flags.ts
index 2a5dff2..29e9259 100644
--- a/polygerrit-ui/app/services/flags/flags.ts
+++ b/polygerrit-ui/app/services/flags/flags.ts
@@ -17,10 +17,7 @@
   NEW_IMAGE_DIFF_UI = 'UiFeature__new_image_diff_ui',
   CHECKS_DEVELOPER = 'UiFeature__checks_developer',
   PUSH_NOTIFICATIONS_DEVELOPER = 'UiFeature__push_notifications_developer',
-  DIFF_RENDERING_LIT = 'UiFeature__diff_rendering_lit',
   PUSH_NOTIFICATIONS = 'UiFeature__push_notifications',
   SUGGEST_EDIT = 'UiFeature__suggest_edit',
-  MENTION_USERS = 'UiFeature__mention_users',
-  RENDER_MARKDOWN = 'UiFeature__render_markdown',
   REBASE_CHAIN = 'UiFeature__rebase_chain',
 }
diff --git a/polygerrit-ui/app/services/router/router-model.ts b/polygerrit-ui/app/services/router/router-model.ts
index c3c1cb6..5e2cc10 100644
--- a/polygerrit-ui/app/services/router/router-model.ts
+++ b/polygerrit-ui/app/services/router/router-model.ts
@@ -21,12 +21,17 @@
   SETTINGS = 'settings',
 }
 
+// TODO: Consider renaming this to AppElementState or something similar.
+// Or maybe RootViewState. This class does *not* model the state of the router.
 export interface RouterState {
   // Note that this router model view must be updated before view model state.
   view?: GerritView;
 }
 
 export const routerModelToken = define<RouterModel>('router-model');
+
+// TODO: Consider renaming this to AppElementViewModel or something similar.
+// Or maybe RootViewModel. This class is *not* a view model of the router.
 export class RouterModel extends Model<RouterState> {
   readonly routerView$: Observable<GerritView | undefined> = select(
     this.state$,
diff --git a/polygerrit-ui/app/styles/gr-page-nav-styles.ts b/polygerrit-ui/app/styles/gr-page-nav-styles.ts
index b6e8f60..963b2a2 100644
--- a/polygerrit-ui/app/styles/gr-page-nav-styles.ts
+++ b/polygerrit-ui/app/styles/gr-page-nav-styles.ts
@@ -16,13 +16,16 @@
     border-top: 1px solid transparent;
     display: block;
     padding: 0 var(--spacing-xl);
-  }
-  .navStyles li a {
-    display: block;
     overflow: hidden;
     text-overflow: ellipsis;
     white-space: nowrap;
   }
+  .navStyles li a {
+    display: block;
+    /* overflow and text-overflow are not inherited, must repeat them */
+    overflow: hidden;
+    text-overflow: ellipsis;
+  }
   .navStyles .subsectionItem {
     padding-left: var(--spacing-xxl);
   }