I can not reproduce this problem with -2. Either with fresh ~/.mozilla or with my old one it's working.
Do you have saved the password for the login using the password manager?

Ye, I have a few saved for it.

I tried it again after accessing the page through crashing the browser then doing a restore session and the page worked fine but if I shut the browser down the visit it again from the first page I get the seg fault.

I'm happy to try other other things if you want to try to narrow it down.

I get the same error after doing full system upgrad last night. It happens every time I run firefox as a normal user.

Firefox only works now when run as root with sudo.

Trying a fresh profile doesn't help. Safe Mode gives the same error.

Here is what got updated:
[2007-09-12 02:11] upgraded attr (2.4.38-1 -> 2.4.39-1)
[2007-09-12 02:11] upgraded acl (2.2.44-1 -> 2.2.45-1)
[2007-09-12 02:11] upgraded device-mapper (1.02.21-1 -> 1.02.22-1)
[2007-09-12 02:11] upgraded gc (6.8-1 -> 7.0-1)
[2007-09-12 02:11] upgraded libldap (2.3.37-1 -> 2.3.38-1)
[2007-09-12 02:11] upgraded gnupg2 (2.0.6-1 -> 2.0.7-1)
[2007-09-12 02:11] upgraded icon-naming-utils (0.8.5-1 -> 0.8.6-1)
[2007-09-12 02:12] update desktop mime database ...
[2007-09-12 02:12] upgraded inkscape (0.45.1-3 -> 0.45.1-4)
[2007-09-12 02:12] upgraded jfsutils (1.1.11-1 -> 1.1.12-1)
[2007-09-12 02:12] upgraded links (2.1pre29-1 -> 2.1pre30-1)
[2007-09-12 02:12] upgraded lvm2 (2.02.27-1 -> 2.02.28-1)
[2007-09-12 02:12] upgraded mdadm (2.6.2-1 -> 2.6.3-1)
[2007-09-12 02:12] upgraded openssh (4.6p1-4 -> 4.7p1-1)
[2007-09-12 02:12] upgraded pkgconfig (0.21-1 -> 0.22-1)
[2007-09-12 02:12] upgraded qt-enhanced (3.3.8-11 -> 3.3.8-12)
[2007-09-12 02:12] upgraded qtcurve-gtk2 (0.52.3-1 -> 0.53-1)
[2007-09-12 02:12] upgraded qtcurve-kde3 (0.52.3-1 -> 0.53-1)
[2007-09-12 02:12] upgraded smbclient (3.0.25c-1 -> 3.0.26a-1)
[2007-09-12 02:12] upgraded sudo (1.6.9p4-1 -> 1.6.9p5-1)
[2007-09-12 02:12] upgraded wireless_tools (29pre21-1 -> 29pre22-1)
[2007-09-12 02:12] upgraded xfsprogs (2.9.3-1 -> 2.9.4-1)
[2007-09-12 02:12] upgraded xfsdump (2.2.45-1 -> 2.2.46-1)

I found the cause for my problem: it is the qtcurve-gtk2 update.

This is probably unrelated to the original problem. Sorry about the noise.

I'm now seeing a similar problem with mozilla-firefox-2.0.0.7-1: the error message is almost the same:
/opt/mozilla/lib/firefox-2.0.0.7/run-mozilla.sh: line 131: 4470 Bus error
"$prog" ${1+"$@"}

This is right after an update with the following upgrades:
atk-1.20.0-1
libxrandr-1.2.2-1
libxi-1.1.3-1
gtk2-2.12.0-1
acroread-8.1.1-1
gconf-2.20.0-1
gnome-vfs-2.20.0-1
libbonobo-2.20.0-1
libgnome-2.20.0-1
gnome-keyring-2.20.0-1
evolution-data-server-1.12.0-1
gnome-common-2.20.0-1
gail-1.20.0-1
libgnomecanvas-2.20.0-1
libbonoboui-2.20.0-1
libgnomeui-2.20.0-1
pygobject-2.14.0-1
gnome-desktop-2.20.0-1
pygtk-2.12.0-1
gnome-menus-2.20.0-1
libwnck-2.20.0-1
gnome-panel-2.20.0.1-1
inputproto-1.4.2.1-1
librsvg-2.18.2-1
xf86dgaproto-2.0.3-1
libxxf86dga-1.0.2-1
libxfont-1.3.1-1
synaptics-0.14.6.99-1
renderproto-0.9.3-1
xf86-input-mouse-1.2.1-5
xf86-input-keyboard-1.2.2-2
xf86-input-evdev-1.1.5-4
vte-0.16.9-1
xf86-video-vesa-1.3.0-5
xkeyboard-config-1.0-1
pixman-0.9.5-2
xorg-server-1.4-2
xproto-7.0.11-1
xorg-xinit-1.0.7-1

I notice that I do not have the qtcurve-gtk2 pkg installed.

Sorry, just realized the problem discription is not too detailed: the crash happens as soon as firefox is invoked.

after strace'ing the crash, it seems that the problem is triggered by the loading of the new acrobat-8.1.1 plugin. After removing it by de-installing acrobat, firefox comes up fine. After re-installing acrobat, the behavior appears to be fine and there is no new crashes.