Rated 4 out of 5 stars

One of the most useful addon I've ever used :-) (for FF and for Thunderbird).
I write in French, Italian, English and Greek and I appreciate very much to switch from a language to another :-D

The only problem is that sometimes (not very often, but it's annoying), the displayed language and the real corrected language don't match. I solve the problem by right-clicking an underlined word and changing the language :-D

This review is for a previous version of the add-on (1.0).