Examine source code of Sunny Stream

{
  "name": "Sunny Stream",
  "short_name": "Sunny",
  "version": "1.2.4resigned1",
  "manifest_version": 2,
  "description": "Esta extensión te avisara cuando Sunny inicie stream.",
  "icons": {
    "16": "img/img16.png",
    "48": "img/img48.png",
    "128": "img/img128.png"
  },
  "browser_action": {
    "default_icon": "img/img72.png",
    "default_popup": "popup.html"
  },
  "author": "Twitter: @GustavoRsz",
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "notifications",
    "https://api.twitch.tv/"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "browser_specific_settings": {
    "gecko": {
      "id": "{cc95709d-c394-4aa3-ae6e-828f137a5ac6}"
    }
  }
}