Examine source code of YouTube Quality Guard

{
  "manifest_version": 3,
  "name": "YouTube Quality Guard",
  "version": "1.0.0",
  "description": "Erzwingt bevorzugte YouTube-Qualität, Playergröße, Lautstärke, Stummschaltung, Playback-Speed und blendet störende Overlays aus.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "action": {
    "default_title": "YouTube Quality Guard",
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.youtube.com/*",
    "*://*.youtube-nocookie.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://*.youtube-nocookie.com/*"
      ],
      "js": [
        "src/content/youtube-controller.js"
      ],
      "css": [
        "src/content/youtube-controller.css"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "src/options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-quality-guard@theglorysaint.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}