Rated 5 out of 5 stars
It works flawlessly. I'd really like 2 more options to personally consider it as perfect, since already you're giving us many options:
1. Give us the option to remove everything from context-menu ( right click ) or at least a better, more professional icon, like "gTranslate" Add-on.
2. Give us the option to adjust the border-radius of the bubble. My Fx is almost entirely squared. 2px b-r or even 0. So...
Anyway, really thank you! I found your translator on Chromium and happily realised that it's avalaible for Fx too.