Examine source code of Universal Video Hotkeys

{
  "manifest_version": 3,
  "name": "Universal Video Hotkeys",
  "version": "1.2",
  "description": "A browser extension that brings YouTube-style keyboard shortcuts to all video players across the web",
  "homepage_url": "https://github.com/phil294/browser-extension-youtube-style-video-hotkeys",
  "browser_specific_settings": {
    "gecko": {
      "id": "universal-video-hotkeys@waritschlager.de"
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "shadow-hook.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "world": "MAIN"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "video.js",
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "shadow-hook.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Universal Video Hotkeys"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}