Examine source code of kukuluLIVE Notification

{
  "name": "kukuluLIVE Notification",
  "version": "2.1.0",
  "manifest_version": 2,
  "description": "kukuluLIVE Notification",
  "browser_action": {
    "default_title": "kukuluLIVE Notification",
    "default_icon": "img/icon48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.erinn.biz/live.mypage.php*"
      ],
      "all_frames": true,
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "page": "background.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "icons": {
    "32": "img/icon32.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "web_accessible_resources": [
    "img/icon48.png"
  ],
  "permissions": [
    "notifications",
    "webRequest",
    "webNavigation",
    "*://*.erinn.biz/",
    "*://*.kuku.lu/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "kukululivenotification@kuku.lu"
    }
  }
}