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FireFox 2.0 now has a built in spell checker which uses underlining of misspelled words which you then right click on the work and select the correct one. But if you prefer the old pop up spell checking box there is Spellbound-II-2.0
This allows you to spell check forms (e.g. message board posts, blog
entries, wysiwyg, etc.) before submitting them when using your Mozilla
Firefox or Mozilla Suite browser.
The old spell checker can be found here SpellBound.