Examine source code of Google Tasks™ Sidebar

{
  "name": "Google Tasks Sidebar",
  "version": "0.1",
  "manifest_version": 2,
  "sidebar_action": {
    "default_title": "Google Tasks",
    "default_panel": "sidebar/sidebar.html"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.google.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "gtasks-sidebar@dotproto"
    }
  }
}