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annoying random Firefox crash - how to debug?

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http://forums.fedoraforum.org – Hi, My firefox (Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.6) Gecko/20091216 Fedora/3.5.6-1.fc11 Firefox/3.5.6) on Gnome 2.26.3 will randomly crash, without any errors. /var/log/messages & /var/log/Xorg.0.log doesn't show anything that caused any errors. And it doesn't matter on which website(s) I'm busy with, it will just crash. Does anyone know how to check for a problem? My PC has: Intel Pentium(R) Dual-Core E5200 CPU 4GB DDRII Corsair RAM 3x 160GB SATAII HDD Asus Nvidia 8800GT graphics card. I have updated to the latest nVidia drivers [root@Rudi-PC ~]# dmesg | grep nvidia nvidia: module license 'NVIDIA' taints kernel. nvidia 0000:01:00.0: setting latency timer to 64 nvidia-config-d[1399]: segfault at 7f0888000000 ip 0000003ff107bf54 sp 00007ffff39d1898 error 4 in libc-2.10.2.so[3ff1000000+164000] [root@Rudi-PC ~]# dmesg | grep nvidia nvidia: module license 'NVIDIA' taints kernel. nvidia 0000:01:00.0: setting latency timer to 64 nvidia-config-d[1399]: segfault at 7f0888000000 ip 0000003ff107bf54 sp 00007ffff39d1898 error 4 in libc-2.10.2.so[3ff1000000+164000] [root@Rudi-PC ~]# uname -a Linux Rudi-PC 2.6.30.10-105.2.23.fc11.x86_64 #1 SMP Thu Feb 11 07:06:34 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux This is on Fedora Core 12 x86 I have disabled the only 3 Firefox plug-ins that I installed yesterday, but this problem has been looming for a long time. Something interesting that I picked up is that Thunderbird will close randomly (very seldom though) as well, so I don't know if it's Firefox specific though. I have picked up that it happens more often when my PC's memory usage is above 2GB RAM, and memtest86+ didn't indicate any memory problems. If I have less tabs open, it happens less often, but the more tabs I have open, the more often it happens. At the same time, on the same PC, when I'm in Windows XP SP3 (dual boot), I can have many more tabs open as well as Thunderbird, Quickbooks, Photoshop CS3 and some other applications, and it doesn't cash. (HowTos)