A cross-browser editor
Hey, look at the editor: http://www.chel.tv/rich/.
Your Lord and Master, Foamy
The beta of HTMLArea also supports Mozilla based browsers and Gecko's Midas editor components.
This version of vBulletin also supports Gecko based browsers such as Mozilla 1.4+, Mozilla Firebird 0.7+ and some others with its WYSIWYG editor.