Examine source code of Steam: Ой, извините!

{
  "manifest_version": 3,
  "name": "Steam: Ой, извините!",
  "version": "1.0.0",
  "description": "Восстанавливает видимость недоступных в России Steam игр: открывает заблокированные страницы из под другого региона и показывает заблокированные игры в поиске.",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "declarativeNetRequest",
    "cookies",
    "storage"
  ],
  "host_permissions": [
    "*://*.steampowered.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.steampowered.com/*"
      ],
      "js": [
        "src/steamsorry-content.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "src/steamsorry-page.js"
      ],
      "matches": [
        "*://*.steampowered.com/*"
      ]
    }
  ],
  "background": {
    "service_worker": "src/steamsorry-worker.js",
    "scripts": [
      "src/steamsorry-worker.js"
    ]
  },
  "options_ui": {
    "page": "src/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "steamsorry-ext@progresso",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}