Examine source code of fireproxy configurator

{
  "manifest_version": 3,
  "name": "fire prozy configurator",
  "version": "1.0",
  "description": "Направляет трафик через указанный прокси-сервер.",
  "permissions": [
    "proxy",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "my-proxy-extension@example.com",
      "strict_min_version": "91.1.0"
    }
  }
}