Examine source code of YT-Ads-Blocker-Pro

{
  "manifest_version": 2,
  "name": "YouTube Ad Blocker Personal",
  "version": "1.2.2",
  "description": "Robust YouTube ad blocker—now with correct video playback. Blocks only truly ad-related streams and UI overlays.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.youtube.com/*",
    "*://*.youtube-nocookie.com/*",
    "*://*.googlevideo.com/*",
    "*://*.doubleclick.net/*",
    "*://*.googlesyndication.com/*",
    "*://*.googleadservices.com/*",
    "*://*.googleads.g.doubleclick.net/*",
    "*://*.ytimg.com/*",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-adblocker-pro@example.com"
    }
  }
}