Very bad - generally not understandable in French - translation. I moved from Systran 8 Pro to another more serious system.

this addon work just fine, try to go to SYSTRAN Platform and get an API Key first , it used to be unavailable for quite a long time on firefox tho

Don't waste your time. Systran is a joke. The server doesn't respond (when reloading language list that is always empty), and clicking the context menu item, when selecting a word, brings an empty page.