Adam,
Well we hope so. We did a lot of research to figure out exactly what was causing this error. It turns out that we can duplicate this problem anytime a Rich Text Editor is used within the DNN Section control. The section control is what allows for the sections to be minimized/maximized from the plus/minus buttons. If we remove all of the section controls the form because WAY too long but we don't have the same problem with the text editor. I did notice that the text editor that is getting distributed with DotNetNuke is slightly older then the latest release of the free text box but not really sure if thats the issue. If anyone else has any information on this please pass it along.
Just to be clear though, all of the 'user-facing' areas of the module work with Firefox, only some of the back-end features where this problem occurs.
-Chad