Examine source code of HTML5 Gamepad Detector

{
  "manifest_version": 2,
  "name": "HTML5 Gamepad Detector",
  "version": "0.0.23",
  "description": "This project is using HTML5 Gamepad API which can monitor your gamepads connected to your computer in a web browser.",
  "homepage_url": "https://bitbucket.org/hkgoldenmra/hkgoldenmra.bitbucket.io/src/master/html5-gamepad-detector/",
  "applications": {
    "gecko": {
      "id": "hkgolden2003a@gmail.com"
    }
  },
  "icons": {
    "128": "logo/128.png"
  },
  "browser_action": {
    "default_icon": "logo/128.png",
    "default_title": "Open HTML5 Gamepad Detector"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  }
}