Examine source code of Skip Youtube Ads

{
  "manifest_version": 2,
  "name": "Skip Youtube Ads",
  "version": "1.0",
  "description": "Instant removal of YT skippable video ads and overlayed ads.",
  "icons": {
    "16": "icons/skip-track-16.png",
    "32": "icons/skip-track-32.png",
    "48": "icons/skip-track-48.png",
    "128": "icons/skip-track-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "youtube-skip-ads.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b2057b61-ed03-47f3-9090-e6df36c722b4}"
    }
  }
}