As it seems this issue is already discussed as a firefox-bug here: https://launchpad.net/distros/ubuntu/+source/firefox/+bug/14911
They say it's because the composite extension is enabled on edgy by default. I couldn't find it in my xorg.conf, but maybe it's a default used by the binary. So I tried this in my xorg.conf: Section "Extensions" Option "Composite" "false" EndSection As far as I can say there are no more crashes for me. -- Flash Causes Firefox 2.0 to crash in Edgy https://launchpad.net/bugs/68086 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs