Examine source code of googlecojp-search

{
  "manifest_version": 2,
  "name": "www.google.co.jp",
  "description": "デスクトップ版Firefoxの検索エンジンに、 www.google.com よりRTTの良い www.google.co.jp を追加する最小限のアドオン",
  "version": "1.0.0",
  "author": "nyanshiba",
  "homepage_url": "https://github.com/nyanshiba/firefox-addon-googlecojp-search",
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "www.google.co.jp",
      "search_url": "https://www.google.co.jp/search?q={searchTerms}",
      "is_default": false,
      "favicon_url": "https://www.google.co.jp/favicon.ico",
      "keyword": "jp"
    }
  }
}