--- a/toolkit/components/extensions/schemas/browser_settings.json
+++ b/toolkit/components/extensions/schemas/browser_settings.json
@@ -2,17 +2,17 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "manifest",
     "types": [
       {
-        "$extend": "Permission",
+        "$extend": "OptionalPermission",
         "choices": [{
           "type": "string",
           "enum": [
             "browserSettings"
           ]
         }]
       }
     ]