Examine source code of Unlock Music

{
  "manifest_version": 2,
  "name": "音乐解锁",
  "short_name": "音乐解锁",
  "icons": {
    "128": "./img/icons/msapplication-icon-144x144.png"
  },
  "description": "在任何设备上解锁已购的加密音乐！",
  "offline_enabled": true,
  "options_page": "./index.html",
  "homepage_url": "https://github.com/ix64/unlock-music",
  "browser_action": {
    "default_popup": "./popup.html"
  },
  "version": "1.8.1.1",
  "version_name": "1.8.1 rev1"
}