Examine source code of Apple TV Speed Controller

{
  "manifest_version": 2,
  "name": "AppleTVSpeedController",
  "version": "1.0",
  "description": "Enables you to change Apple TV playback speed. Press Period/Comma to Increase/Decrease",
  "icons": {
    "48": "icons/speedometer-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://tv.apple.com/*"
      ],
      "js": [
        "tv.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{13057e2a-f106-47f1-8f1d-d0de8cda61cf}"
    }
  }
}