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chrome/common/extensions/api/_api_features.json

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This features file defines extension APIs implemented under src/chrome.
 // See chrome/common/extensions/api/_features.md to understand this file, as
 // well as feature.h, simple_feature.h, and feature_provider.h.
 //
 // Note that specifying "web_page", "blessed_web_page", or "all" as a context
 // type will require manually updating chrome/renderer/resources/dispatcher.cc.
@@ skipping 727 matching lines @@
     "contexts": ["blessed_extension"]
   },
   "systemPrivate": {
     "dependencies": ["permission:systemPrivate"],
     "contexts": ["blessed_extension"]
   },
   "tabCapture": {
     "dependencies": ["permission:tabCapture"],
     "contexts": ["blessed_extension"]
   },
-  "tabs": {
+  "tabs": [{
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"],
     "contexts": ["blessed_extension", "extension_service_worker"]
-  },
+  }, {
+    "channel": "stable",
+    "contexts": ["webui"],
+    "matches": [
+      "chrome://bookmarks/*"
+    ]
+  }],
   "terminalPrivate": {
     "dependencies": ["permission:terminalPrivate"],
     "contexts": ["blessed_extension"]
   },
   "topSites": {
     "dependencies": ["permission:topSites"],
     "contexts": ["blessed_extension"]
   },
   "tts": {
     "dependencies": ["permission:tts"],
@@ skipping 70 matching lines @@
     "internal": true,
     "channel": "stable",
     "dependencies": ["permission:webview"],
     "contexts": ["blessed_extension"]
   },
   "windows": {
     "dependencies": ["api:tabs"],
     "contexts": ["blessed_extension"]
   }
 }