gnome-bugs #581526 is the upstream GTK crash bug (which seems fixed for people here now?)
mozilla-bugs #497561 is the "XID collision" flood of messages upstream with the Firefox guys, but no-one owns the bug yet
xlibs #21573 is a crash which is related to the same XID problem, but isn't necessarily the exact same bug
...and this bug is tracking the non-fatal problem with "XID collision" messages?
So:
gnome-bugs #581526 is the upstream GTK crash bug (which seems fixed for people here now?)
mozilla-bugs #497561 is the "XID collision" flood of messages upstream with the Firefox guys, but no-one owns the bug yet
xlibs #21573 is a crash which is related to the same XID problem, but isn't necessarily the exact same bug
...and this bug is tracking the non-fatal problem with "XID collision" messages?