A lot of improvements went into Firefox 4 that also affected compatibility with the Mozilla XForms extension. We have been trying to keep up with the developments and with Beta 8 of Firefox 4 there should be no more breaking changes. To make sure we didn't miss any important regressions over the previous versions, I put together a preview release of Mozilla XForms for Firefox 4, which is available for download now:
It requires at least Firefox 4 Beta 8 and works on Windows (x86) and Linux (x86 and x86_64).
Please test this version with your forms and report any problems you find! It helps us to deliver a great version of the extension for Firefox 4!
An (incomplete) list of changes is available.
Looking forward to your feedback!