This is not quite as convenient, but if you have DuckDuckGo as your default search engine, you can put !translate at the beginning of the URL and it will redirect you.

If you don't want to use a third party, open the large version of the Firefox bookmarks manager (ctrl+shift+b) and make a new bookmark with URL https://translate.google.com/#view=home&op=translate&sl=auto... and keyword "translate". Then you can just put the word "translate" before a URL and it will take you to Google Translate directly.

Did you try extensions and not like them? https://www.google.com/search?client=firefox-b-1&q=firefox+t...