Examine source code of YT no distractions

{
  "name": "YT no distractions",
  "description": "No distractions on YouTube.",
  "version": "1.2",
  "manifest_version": 3,
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "run_at": "document_end",
      "js": [
        "./yt-no-distractions.js"
      ],
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "no-distractions-yt@corny.me"
    }
  }
}