Examine source code of ComfyTube

{
  "manifest_version": 2,
  "name": "ComfyTube",
  "description": "Adds Picture-in-Player button, makes you able to play any YouTube Shorts as a normal video",
  "version": "1.0",
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "host_permissions": [
    "https://www.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "scripts/button.js",
        "scripts/fullscreen.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{36a59088-1a91-4781-9894-fe4128c29155}"
    }
  }
}