Examine source code of iCloud Fullscreen

{
  "name": "__MSG_appName__",
  "version": "0.1.7",
  "manifest_version": 2,
  "description": "__MSG_appDesc__",
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "default_locale": "en",
  "browser_action": {
    "default_title": "iCloud",
    "default_icon": "icon.png"
  },
  "background": {
    "persistent": true,
    "scripts": [
      "background.js"
    ]
  }
}