Rated 5 out of 5 stars

Great add-on and a must have - I just wish everyone would use a spell checker!

FIREFOX BUG:
Firefox keeps changing the default language, for example: English (UK) back to English (US). As explained previously, this is a Firefox and Thunderbird bug. This bug has been around for years - planet America strikes again I'm afraid!

This review is for a previous version of the add-on (2.22).