Examine source code of YT Vids Start at Start

{
  "manifest_version": 3,
  "version": "0.1.0",
  "name": "YT Vids Start at Start",
  "description": "Makes sure youtube videos start at the beginning instead of an arbitrary point.",
  "icons": {
    "512": "/assets/YTVidsStartAtStart.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ytvidsstartatstart@kingiwrs.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/watch?*"
      ],
      "js": [
        "/js/js.js"
      ],
      "run_at": "document_idle"
    }
  ]
}