How to remove the Toolbar

Binary package hint: firefox

I find the Toolbar in Thunderbird 3.1 very. very annoying. How to remove it?,

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: firefox 3.6.6+nobinonly-0ubuntu0.10.04.1
ProcVersionSignature: Ubuntu 2.6.32-24.38-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Thu Jul 22 12:38:37 2010
FirefoxPackages:
 firefox 3.6.6+nobinonly-0ubuntu0.10.04.1
 firefox-gnome-support 3.6.6+nobinonly-0ubuntu0.10.04.1
 firefox-branding 3.6.6+nobinonly-0ubuntu0.10.04.1
 abroswer N/A
 abrowser-branding N/A
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox