firefox crashed with SIGSEGV in JS_HashTableRawLookup()

[sveri]

Binary package hint: firefox-3.0

Firefox crashes randomly on opening new tabs.
Sometimes if i want to surf to another site.

I cannot reproduce it.
The only repeating thing is that firefox is very unstable
after a new start and crashes twice to five times but then
remains stable most of the time.

lsb_release -rd
Description: Ubuntu intrepid (development branch)
Release: 8.10

firefox-3.0:
  Installed: 3.0.1+build1+nobinonly-0ubuntu2
  Candidate: 3.0.1+build1+nobinonly-0ubuntu2
  Version table:
 *** 3.0.1+build1+nobinonly-0ubuntu2 0
        500 http://de.archive.ubuntu.com intrepid/main Packages
        100 /var/lib/dpkg/status

ProblemType: Crash
Architecture: amd64
CrashCounter: 1
DistroRelease: Ubuntu 8.10
ExecutablePath: /usr/lib/firefox-3.0.1/firefox
NonfreeKernelModules: nvidia
Package: firefox-3.0 3.0.1+build1+nobinonly-0ubuntu2
ProcAttrCurrent: unconfined
ProcCmdline: /usr/lib/firefox-3.0.1/firefox --sm-config-prefix /firefox-UIYH0V/ --sm-client-id 1021d1821b81c4000121995101700000105750038 --screen 0
ProcEnviron:
 PATH=/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/bash
 LANGUAGE=en_US
Signal: 11
SourcePackage: firefox-3.0
StacktraceTop:
 JS_HashTableRawLookup ()
 ?? () from /usr/lib/xulrunner-1.9.0.1/libmozjs.so
 ?? () from /usr/lib/xulrunner-1.9.0.1/libmozjs.so
 ?? () from /usr/lib/xulrunner-1.9.0.1/libmozjs.so
 ?? () from /usr/lib/xulrunner-1.9.0.1/libmozjs.so
Title: firefox crashed with SIGSEGV in JS_HashTableRawLookup()
Uname: Linux 2.6.26-5-generic x86_64
UserGroups: adm admin audio cdrom dialout dip floppy fuse kqemu kvm lpadmin plugdev vboxusers video