I'm running current Rawhide, with GNOME on Wayland as my desktop. It seems that whenever a file dialog should appear in Firefox - e.g. when I want to download a file, or attach a file to a bug - Firefox crashes. Firefox's crash reporter intercepts the crash (so I can't file an abrt report), but I'll reproduce from a console in a second and see if I get any useful messages there. Should hopefully be easy to reproduce, though.
I can attach the info from the Mozilla crash reporter, but not sure if there's anything sensitive in it so would prefer not to unless you need it - please let me know if you do. Thanks!
Should be fixed by gvfs update, see bug 1472819 for details. *** This bug has been marked as a duplicate of bug 1472819 ***