Examine source code of MyYoutube

{
  "manifest_version": 3,
  "name": "MyYoutube",
  "version": "1.2.6",
  "description": "Customize the layout of your YouTube homepage",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "konospas@gmail.com",
      "strict_min_version": "109.0"
    }
  },
  "action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "icon128.png"
  }
}