I had the same experience as the last reviewer. I think the latest version doesn't work with FF 52.8.1. I had used the earliest version 0.5.0 with no problem whatsoever.
Edit: Thanks to the developer for the prompt response. I should have mentioned that I'll change the rating to 5 stars if I see this or an earlier version working as usual.
Edit (as of April): Yes, the new v. 4.0.2 works perfectly. 5 stars. Thank you!
Edit: There is a minor bug, right-clicking "translate with Bing" opens up a blank Bing translate tab with no text. Have to copy and paste it to the tab.

la traduccion en español se la pasa el trabajo a la pagina de google, no es diferente a los demas traductores, yo busco un traductor que lo haga en la misma pagina que estoy y que adapte sin alterar el link o enviarme a otra pagina.

Does not work on a mobile browser. If I select some text, "translate' is not in the selection context menu. It is in the page context menu, but it does nothing.

Super Erweiterung, ich benutze sie fast täglich. Es ist eines der wenigen wo man Deepl verwenden kann, den im Moment besten translator ( gekauft oder kostenlos ).

Works well on MacOS and FF 68

la estoy probando y me parese bien ! si todo sale bien le doy otra estrella mas

Jassim needed

Sorry, last version does not work. Set to use and show only DeepL, it doesn't react. FiFo ESR v52.8.0

Limited to 5000 characters with the free add-on = good enough for me