Examine source code of Better UI for Gemini

{
  "manifest_version": 3,
  "name": "Better UI for Gemini",
  "version": "1.1",
  "description": "Модульная модификация интерфейса Gemini",
  "browser_specific_settings": {
    "gecko": {
      "id": "better-ui-gemini@extension.local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Настройки Better UI"
  },
  "content_scripts": [
    {
      "matches": [
        "*://gemini.google.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}