Examine source code of Forced Google UK

{
  "manifest_version": 2,
  "name": "Forced Google UK",
  "description": "Make the Google search result show Google UK results reglardless of your geolocation.",
  "version": "1.1",
  "author": "Sin Jeong-hun",
  "icons": {
    "128": "icon128.png"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Google UK",
      "search_url": "https://www.google.com/search?q={searchTerms}&gl=gb",
      "suggest_url": "https://suggestqueries.google.com/complete/search?client=chrome&gl=gb&q={searchTerms}",
      "keyword": "guk",
      "favicon_url": "https://www.google.com/favicon.ico",
      "is_default": false
    }
  }
}