Rated 5 out of 5 stars

Great tool that I use all the time!

The ability to customize what color misspelled words are highlighted with is nice for theme integration.

No problems with FF 3.5 or 3.0.

I have tested it with the OpenMedSpel medical spelling Add-On, and it works flawlessly.

You can find OpenMedSpel at AMO here -
https://addons.mozilla.org/en-US/firefox/addon/6526

This review is for a previous version of the add-on (3.0.6).