title: Submitted Chrome extension: "manifest is invalid" on download
body: <p>I recently submitted a chrome extension, but when I try to download the extension it says that the manifest file is invalid. Not sure why.</p>
  
  <p>Here is my manifest :</p>
  
  <pre><code>{
      "name": "My chrome extension",
      "version": "0.2",
      "description": "My chrome extension description.",
      "permissions": [ "activeTab", "tabs", "contextMenus" ],
      "background": {
          "persistent": false
      },
      "browser_action": {
          "default_icon": "favicon.png",
          "default_popup": "index.html"
  },
   "manifest_version": 2
  }
  </code></pre>
  
  <p>Is there a tool online where I can validate a Chrome extension manifest file?</p>