Release notes for M9.

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "unprivileged": true,
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
@@ skipping 4116 matching lines @@
                 "items": {
                   "$ref": "ExtensionInfo"
                 }
               }
             ]
           }
         ]
       },
       {
         "name": "get",
-        "description": "Return information about the installed extension with the given ID.",
+        "description": "Return information about the installed extension or app that has the given ID.",
         "parameters": [
           {
             "name": "id",
             "type": "string",
             "description": "The ID from an item of $ref:ExtensionInfo."
           },
           {
             "type": "function",
             "name": "callback",
             "optional": "true",
@@ skipping 217 matching lines @@
                   "token": { "type": "string", "optional": true }
                 }
               }
             ]
           }
         ]
       }
     ]
   }
 ]