Examine source code of Site Update Checker

{
  "manifest_version": 2,
  "default_locale": "en",
  "author": "trc",
  "name": "__MSG_manifestAppName__",
  "description": "__MSG_manifestAppDescription__",
  "version": "1.0.1",
  "browser_action": {
    "default_icon": {
      "16": "img/icon-16.png",
      "32": "img/icon-32.png",
      "48": "img/icon-48.png"
    },
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "img/icon-16.png",
    "48": "img/icon-48.png",
    "128": "img/icon-128.png"
  },
  "permissions": [
    "<all_urls>",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{07fb2ab5-9006-4e0f-806a-73899b644099}"
    }
  }
}