Examine source code of YouTubeSkipAds

{
  "manifest_version": 2,
  "name": "YouTube",
  "version": "1.0",
  "description": "Skip the YouTube video ads.",
  "icons": {
    "48": "skip.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "youtubeads.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{472746d9-21d9-41b1-af9d-88d940c5fca8}"
    }
  }
}