manifest.json

{
  "content_scripts": [
    {
      "matches": [ "*://*.youtube.com/embed/*?enablejsapi=1&origin=chrome-extension:*" ],
      "all_frames": true,
      "run_at": "document_start",
      "js": [ "js/inject/youTubeIFrameInject.js" ]
    }
  ],
  "web_accessible_resources": [
    "js/inject/interceptor.js"
  ],
  "permissions": [
    "*://*.youtube.com/*"
  ]
}