Examine source code of YouTube Shorts Remote

{
  "manifest_version": 2,
  "name": "YouTube Shorts Playback Controls",
  "version": "1.0",
  "description": "Add playback controls to YouTube Shorts with keyboard shortcuts.",
  "permissions": [
    "activeTab",
    "*://www.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/shorts/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "48": "icon1.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icon1.png"
    },
    "default_title": "YouTube Shorts Controls"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{507c44e9-d935-454f-9450-51c21423edd0}"
    }
  }
}