Examine source code of youtubeFix

{
  "manifest_version": 2,
  "name": "youtubeFix",
  "version": "1.2resigned1",
  "description": "Fixes the youtube full screen scroll bar bug",
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/watch?v=*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fffdc15b-12b2-4f4d-b637-48aedec7e3e5}"
    }
  }
}