The new user, groups and rights management has some bugs in Firefox 3.0 beta1

Editing a group in the new group management interface doesn't work at all. Going to http://localhost:8080/xwiki/bin/admin/XWiki/XWikiGroups?editor=groups&space=XWiki loads the page correctly, but when clicking the edit button for a group, the lightbox loads but the userlist table is empty and has a large scrollbar attached to it (see screenshot). When closing the lightbox, the original table looses some cells (see second screenshot).

Everything works fine in Firefox 2.0.