Haduken.com

A long time ago there once was a Firefox extension to rule them all: Spellbound. This extension allowed you to spell check the contents of forms in Firefox. No longer did you need to worry about getting PWN’d by spelling something wrong in a heated argument about gay marriage. But alas when Firefox 1.5 came around the extension broke and life was sad. However, Rejoice! Today I found the development version of said extension. YESSSS GET EXCITED. Look forward to good spelling.

Note: you may have to install a dictionary to get it working.