I could never find a real spell checker for firefox, or get one to work but finally I found one!
Its spell bound but they updated it to work with 1.5 and added in line spell checking! So now it will underline misspelled words just like word, openoffice, ect!
Yeah but its still beta so until that becomes final it should be useful. I'm not using beta browsers anymore after ff deer park or whatever it was called before 1.0. It used to crash on me every time I opened it.
Been using FF2B1 here for a while, only issue I had was BugMeNot caused a few things to crash, but no biggie. Session manager built in, spellcheck. It rocks.