Below are screen shots of my CMS desk edit screen in IE and in FireFox. As you can see, there are some problems in FF.

First, the FCKEditor needs to have a clear attribute or something to prevent my page layout from causing overlapping edit regions.

Second (and this is the really weird one) the content from the last edit region is showing up in several of the previous regions. Those other regions are always populated with this incorrect data.

FireFox:
http://www.light-spark.com/share/Work/KenticoFF.gif

IE:
http://www.light-spark.com/share/Work/KenticoIE.gif