Can't launch Firefox

[black-beret]

Binary package hint: gnome-system-monitor

Trying to launch Firefox results in error message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system", even though Firefox is not running - confirmed with System Monitor.
Tried restarting, completely uninstalling and reinstalling but with same result.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: gnome-system-monitor 2.28.1-1ubuntu1
ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
Uname: Linux 2.6.35-24-generic i686
Architecture: i386
Date: Tue Dec 28 21:07:53 2010
ExecutablePath: /usr/bin/gnome-system-monitor
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-system-monitor
XsessionErrors:
 (polkit-gnome-authentication-agent-1:1242): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (nautilus:1236): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed
 (nautilus:1236): GdkPixbuf-CRITICAL **: gdk_pixbuf_format_get_name: assertion `format != NULL' failed

[Robert Roth (evfool)]

Which firefox version are you trying to start?

[black-beret (rog-godsmark)]

Can't be certain as can't open to check but searching file system it would appear to be 3.6.13.
At any rate it was installed by default with Ubuntu 10.10 package and have run update manager.

[Robert Roth (evfool)]

Yes, that should be on an up-to-date maverick, thus reassigning this bug to firefox 3.5 package.