I've started having problems using the Web Page Module (and anywhere FCKEditor is needed) in Firefox 3.0.14 because FCKEditor wants to get downloaded to my computer instead of running embedded in the page. It's fine in Explorer 6, but has the same problem in Safari 3.2.
I'm not sure if this is even worth your time, if the future of the Xataface project will involve a switch to TinyMCE.
Beth