Rated 4 out of 5 stars
The add-on looks good and works great with Google Translate. However, with DeepL, the marked text is not automatically copied into the translate window.This review is for a previous version of the add-on (3.1).
I've just tested it and it seems to work fine (I've selected text in email, then right click / "Translate" and the Popup got opened with the text inside.
Could you write me to my support email what steps did you used which didn't worked?
Also, on some devices the Thunderbird have to be restarted after installing addon before the context menu starts to work correctly.