Great GoogleTranslate alternative.
Extension needs no permissions.
I can define translation target language in about:addons preferences.
Can be good if addon asks for setting destination language after installation or detect it automatically from browser settings. Maybe that would require more permissions though.

Better quality translation than Google's...much better. Little annoying to have to right click and then 'send' it to the translator. Should use the same trick as the others, i.e. a pop up logo after selecting text.

It does what it does. Within its limited language range, it performs much better than Google Translate.

Nie otwiera w popup tylko w nowej zakładce