I have Firefox Version 3.0 and it has been automatically identifying and underlining the misspelled words in Red. With Firefox the ABC icon does not appear on page as it does for Internet Explorer users.
Once detected by Firefox, you just have to right click on the word and a drop down menu appears with suggested correctly spelled words. You then click on the right word and voila it is fixed.
I haven't been using Firefox for very long, so I am still learning and so far, I like it.
