Random clash when browsing internet then Freeze and Close firefox-3.0.1

[explorinex]

Binary package hint: firefox-3.0

When I'm browsing the internet the browser is randomly close with no clue.
Sometimes it make Firefox freezing and system monitor say its process is sleeping.
I have to end the process and then start firefox again.
I also disable all add-ons including Ubuntu Modification.

#firefox -v
Mozilla Firefox 3.0.1, Copyright (c) 1998 - 2008 mozilla.org

#uname -a
Linux Machinename 2.6.24-19-generic #1 SMP Fri Jul 11 23:41:49 UTC 2008 i686 GNU/Linux

ProblemType: Bug
Architecture: i386
Date: Tue Aug 19 11:51:48 2008
DistroRelease: Ubuntu 8.04
Package: firefox-3.0 3.0.1+build1+nobinonly-0ubuntu0.8.04.3
PackageArchitecture: i386
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox-3.0
Uname: Linux 2.6.24-19-generic i686

[Andreas Moog (ampelbein)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. However, your crash report is either missing or challenging to deal with as a ".crash" file. Please follow these instructions to have apport report a new bug about your crash that can be dealt with by the automatic retracer.

If you are running the Ubuntu Stable Release you might need to enable apport in /etc/default/apport and restart.

If you are using Ubuntu with the Gnome desktop environment - launch nautilus and navigate to your /var/crash directory and double click on the crash report you wish to submit.
If you are using Kubuntu or Xubuntu you can file the crash using /usr/share/apport/apport-qt --crash-file=/var/crash/_my_crash_report.crash in a terminal - where _my_crash_report.crash is the crash you would like to report.

I'm closing this bug report since the process outlined above will automatically open a new bug report which can then dealt with more efficiently. Thanks in advance for your cooperation and understanding.