Examine source code of udm14

{
  "manifest_version": 3,
  "name": "Google search engine with udm=14 preset",
  "description": "Adds a Google search engine that includes the udm=14 parameter",
  "version": "1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "dhobern@gmail.com",
      "strict_min_version": "106.0"
    }
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "udm14",
      "search_url": "https://www.google.com/search?q={searchTerms}&udm=14",
      "suggest_url": "https://www.google.com/complete/search?client=firefox&q=%s",
      "keyword": "udm14",
      "favicon_url": "favicon.ico",
      "is_default": true,
      "encoding": "UTF-8"
    }
  }
}