I recently see lot of request to my server from browsers with gzip(gfe) in user agent. Which browser uses them in user agent. What it actually do. Some examples below:
https://developers.whatismybrowser.com/useragents/parse/#parse-useragent decodes it as "via Google Frontend". An answer to a similar question here on SO says
You will see this token, if a user translate[s] your website in another language with the Google Translator.
...that is when Google makes a request to your site on behalf of the user when the user uses Google Translate to translate your web page. I just tried it and can confirm I see the request with ,gzip(gfe) in the user agent. The referrer looks like: https://translate.google.com/translate?sl=auto&tl=es&u=<ORIGINAL URL>