More advanced than official add-ons.
The before and after translations are displayed side by side, so it is easy to verify if the translated version is understood by the other party.
You can also swap the sentences, so you can examine the sentences before translation.

Version 0.9.2 works perfect with FF 131.x again.
Best Translator Add-On for me.
Thanks!

Since Firefox 131.0 the addon no longer works. Or DeepL had changed something and it has nothing to do with Firefox 131.0, but is just a coincidence of timing. I don't know.

Update 2024-10-15:
The addon works again.

It was great but it's not working anymore, all text is lost...

This add-on is not working properly. It does not translate the selected text. I have to copy it separately to DeepL.

Esfunktioniert au iMac Firefox nicht. Ärger mit Zeitverlust

Beats Google in accuracy and correct translation of idioms.

The best translator

"Sorry, we couldn't translate your text. Please try again later."

This is the best add-on for Deepl.
If possible, I would like to see "To DeepL translation" also available as a search engine.