firefox crashed with signal 5 in _XError()

[las]

Binary package hint: firefox-3.5

I tried to upload a crash report after uploading it (FF) asked me about keeping 3.5 settings, decide later,and some thing else.i clicked keep settings and it crashed.Every time i use FF after a reboot or log out -in it displays this message.

ProblemType: Crash
Architecture: i386
CrashCounter: 1
Date: Thu Sep 10 21:17:58 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/lib/firefox-3.5.2/firefox
NonfreeKernelModules: nvidia
Package: firefox-3.5 3.5.2+nobinonly-0ubuntu2
ProcCmdline: /usr/lib/firefox-3.5.2/firefox https://bugs.launchpad.net/ubuntu/+source/at-spi/+filebug/auA5lIumiazL6VLDC9RqbNzSoD6?field.title=at-spi-registryd+crashed+with+SIGSEGV+in+_SmcProcessMessage%28%29
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-9.29-generic
Signal: 5
SourcePackage: firefox-3.5
StacktraceTop:
 ?? () from /usr/lib/libgdk-x11-2.0.so.0
 _XError () from /usr/lib/libX11.so.6
 _XReply () from /usr/lib/libX11.so.6
 XGetWindowProperty () from /usr/lib/libX11.so.6
 ?? () from /usr/lib/xulrunner-1.9.1.4pre/libxul.so
Title: firefox crashed with signal 5 in _XError()
Uname: Linux 2.6.31-9-generic i686
UserGroups: adm admin cdrom dialout dip fax fuse lpadmin netdev plugdev sambashare scanner tape vboxusers

[Apport retracing service (apport)]

StacktraceTop:gdk_x_error (display=0xb7c0d800, error=0xbffc36fc)
_XError (dpy=0xb7c0d800, rep=0xb7c70520)
_XReply (dpy=0xb7c0d800, rep=0xbffc3810, extra=0, discard=0)
XGetWindowProperty (dpy=0xb7c0d800, w=44329449,
?? ()

[Micah Gersten (micahg)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 401055, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.