Remove unused permissions

Change-Id: I34e3e9a71e3cd235dc78d4a5ff33edd5963cc96b
diff --git a/src/manifest.json b/src/manifest.json
index 6fe8d74..0ce92a0 100644
--- a/src/manifest.json
+++ b/src/manifest.json
@@ -26,14 +26,11 @@
   ],
   "content_security_policy": "default-src 'none'; script-src 'self'; style-src 'unsafe-inline'; connect-src https://*",
   "permissions": [
-    "debugger",
     "activeTab",
     "<all_urls>",
-    "notifications",
     "storage",
     "tabs",
     "webRequest",
-    "webRequestBlocking",
-    "declarativeContent"
+    "webRequestBlocking"
   ]
 }
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