vewing file online when firefox freezes and i have to push power button to get control

Binary package hint: firefox-3.5

when viewing files online for some reason firefox freezes and will not allow me to use my mouse or keyboard. This started when i upgraded to Ubuntu 9.10
The machine i am using only has Linux Ubuntu installed and all updates that are provided by the Ubuntu Team.

ProblemType: Bug
Architecture: amd64
Date: Mon Nov 16 19:31:54 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: firefox-3.5 3.5.5+nobinonly-0ubuntu0.9.10.1
ProcEnviron:
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: firefox-3.5
Uname: Linux 2.6.31-14-generic x86_64
XsessionErrors:
 (gnome-settings-daemon:1826): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (nautilus:1914): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (polkit-gnome-authentication-agent-1:1978): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (gnome-panel:1913): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -4 and height 24