Examine source code of YouTube Focus

{
  "manifest_version": 3,
  "name": "YouTube Focus",
  "version": "1.0",
  "description": "Ativa modo teatro, expande descrição e ajusta altura do player no YouTube.",
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/watch*"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "scripting"
  ],
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-focus@bergson.me",
      "strict_min_version": "109.0"
    }
  }
}