Firefox does not support Rich text editing for SharePoint 2007 and MOSS.
http://blogs.msdn.com/sharepoint/archive/2006/07/19/671735.aspx
Possible Solution
Firefox does not support Rich text editing for SharePoint 2007 and MOSS.
http://blogs.msdn.com/sharepoint/archive/2006/07/19/671735.aspx
Possible Solution