Examine source code of Add OALD Search Engine

{
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "OALD",
      "search_url": "https://www.oxfordlearnersdictionaries.com/search/english/?q={searchTerms}",
      "favicon_url": "https://www.oxfordlearnersdictionaries.com/favicon.ico",
      "keyword": "@oald"
    }
  },
  "manifest_version": 2,
  "name": "Add OALD Search Engine",
  "version": "1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a7119d0a-2c82-4fe6-b967-eae0f5bdac6e}"
    }
  }
}