Examine source code of Fixed Youtube Player

{
  "manifest_version": 2,
  "name": "Fixed Youtube Player",
  "version": "1.1",
  "description": "This firefox extension fixes the youtube video player errors by replacing the default player by the embed one.",
  "icons": {
    "48": "icons/fixed_youtube_player_48.png",
    "96": "icons/fixed_youtube_player_96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9cc90c1d-5328-451f-a2ec-1f6225ede522}"
    }
  }
}