Almost perfect!

After gTranslate was terminated this is the most convenient addon for translation.

Best translator app ever! even better then Google Translator on Chrome

Although I started with Google Translate on Chrome, I now prefer ImTranslator on Firefox.

All I have to do is Ctrl-C on the text I'm reading and click on the bubble that appears. Google is one of several translations offered. The behaviour is very flexible – there are lots of options.

But for me, the biggest plus is the text-to-speech. The player has a menu option to save as an MP3. On Chrome this is hidden or unavailable. One of several reasons why I now prefer Firefox.

Version 15.55 (I think) broke click events on some websites. For example on https://help.nextcloud.com/ clicking the sign up or log on buttons at the top of the page won't popup the dialog. Hope this can be fixed because I use this add-on a lot. (on FF78)
Edit: thanks for fixing!

Für mich einer der besten Übersetzer den ich gesehen habe, durch die vielfalt kann man entscheiden welchen Übersetzer man auswählt, neben Google gibt es auch Microsoft und Yandex als Übersetzer.

Работает, но зачастую выходят кривые версии.

With recent versions, when I copy multi line code text from github (e.g. https://github.com/jsfaint/gen_tags.vim/blob/master/plugin/gen_tags.vim), this add-on will add tab to every line except the first. Could you fix it?

Llevo años con la extensión, pero, ahora me bloquea los botones de Gmail y otros botones de varias páginas. Desafortunadamente, me tocó desinstalarlo.