Examine source code of Qwant

{
  "browser_specific_settings": {
    "gecko": {
      "id": "{ac2b7ffb-2186-41bb-a61d-0443875f30ea}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "description": "Adds Qwant as the default search engine.",
  "short_name": "Qwant",
  "icons": {
    "128": "icons/icon.png"
  },
  "version": "1.5",
  "manifest_version": 2,
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "chrome_settings_overrides": {
    "search_provider": {
      "search_url": "https://www.qwant.com/?q={searchTerms}",
      "name": "Qwant Search",
      "keyword": "qwant",
      "encoding": "UTF-8",
      "is_default": true,
      "favicon_url": "https://www.qwant.com/favicon.ico"
    }
  },
  "name": "Qwant Search"
}