Description of problem:

[New Thread 9202]
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Core was generated by `/usr/lib64/firefox-3.1b2/firefox'.
Program terminated with signal 11, Segmentation fault.
#0  0x0000003d61c0edeb in raise (sig=<value optimized out>)
    at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:42
42				 sig);


Version-Release number of selected component (if applicable):

firefox-3.1-0.7.beta2.fc11.x86_64
xulrunner-1.9.1-0.9.beta2.fc11.x86_64

Linux dhcp-lab-124.englab.brq.redhat.com 2.6.29-0.237.rc7.git4.fc11.x86_64 #1 SMP Wed Mar 11 18:55:04 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

How reproducible:

no idea, first time I've seen it

Steps to Reproduce:
1. quit firefox

Actual results:

Core dumped, but Firefox, when opened after the crash, looked pretty good - tabs were in place as expected.