Okay, to get this to work under the full, WYSIWYG editor, you need to right click on the text box and choose 'spell check this field'. This, of course, is under FF2.0.
If it underlines a word as being spelled incorrectly, just double click on the word to highlight it, right click, and then at the top of the context menu it will have suggestions or 'add to dictionary' (FYI - the word 'okay' is NOT in the dictionary but 'WYSIWYG' is...)
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