Rated 5 out of 5 stars

A very very useful plugin, works excellent in both Windows and Ubuntu, and in all versions of Firefox (that i have used so far).

One additional feature I am dreaming about is ability to automatically detect language. It's quite often a case when i write in Lithuanian in one tab, and then switch back to English. Constantly selecting spell checking plugin is quite a nuisance. I believe this feature request targets more whole Firefox app, than just this plugin.

Dié resensie is oor 'n vorige weergawe van dié byvoeging (1.2.1.20101118). 

Yep, what you want should be the app's functionality, not that of a dictionary (which I'm providing here mainly for the users of English versions of Firefox in Lithuania). Although, automatic language detection is not that easy, I guess. I think you may find it easier to develop a habit to use <Menu>→K→A and <Menu>→K→L to quickly change the dictionary in use without moving your hands away from the keyboard.

Though it's probably worth to file a feature request (if there isn't one) asking for Firefox to automatically choose a dictionary depending on the keyboard layout in use. It wouldn't cover all cases, but would at least be helpful in some.