ALT+1-n wont change tabs

Binary package hint: firefox-3.1

both on FF3.0 and 3.1 I dont seem to be able to use the ALT+ a number to change between tabs.
I have ubufox disable due to bug #281348

Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.4) Gecko/2008111619 Ubuntu/9.04 (jaunty) Firefox/3.0.4 ID:2008111619
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b2) Gecko/20081128 Ubuntu/9.04 (jaunty) Shiretoko/3.1b2 ID:20081128200728

Adblock Filterset.G Updater 0.3.1.3
Adblock Plus 1.0
Add N Edit Cookies 0.2.1.3
Better Gmail 2 0.7.1
Better GReader 0.4
BlockSite 0.7.1
Browse Images 0.4.1
Configuration Mania 1.09.2008110302
Cookie Button in the status bar 0.9
Corrector para Português Europeu 8.11.13.0
CustomizeGoogle 0.76
Dictionary Switcher 1.0
Download Statusbar 0.9.6.3
dragdropupload 1.6.8
Fasterfox 2.0.0 [DISABLED]
Firebug 1.05
Foxmarks Bookmark Synchronizer 2.6.0
Fullerscreen 2.4
GMarks 0.9.9
GO 1.0.0 beta
Google Notebook 1.0.0.22
Greasemonkey 0.8.20080609.0
Hide Menubar 1.0.20080912
Image Zoom 0.3.1
ImageBot 4.0.3 [DISABLED]
ImgTag 0.3.3
Jaikungfu 0.3.10
Link Alert 0.8.2.1
Linkification 1.3.5
Live HTTP headers 0.14
Mozilla XForms 0.8.6ff3
Mr Uptime 0.9.2
Netcraft Anti-Phishing Toolbar 1.2
NextPlease 0.6.6
Nightly Tester Tools 2.0.2
No Squint 1.93.2.1
NoScript 1.8.7
Organize Status Bar 0.6.2
Paste and Go 2 0.8
QuickRestart 1.1.4
Read it Later 0.9928
RefControl 0.8.11
Remove It Permanently 1.0.6.4
ScrapBook 1.3.3.9
Secure Login 0.9.3
ShowIP 0.8.09r21b0269
Tab Mix Plus 0.3.7.3
Textarea Cache 0.5.2
Ubuntu Firefox Modifications 0.6 [DISABLED]
UnPlug 1.6.06
Uppity 1.5.1
VideoDownloader 1.1.1
ViewMyCurrency 0.3897
Web Developer 1.1.6

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
NonfreeKernelModules: nvidia
Package: firefox-3.1 3.1~b2+build1+nobinonly-0ubuntu1
ProcEnviron:
 SHELL=/bin/bash
 PATH=/root/scripts:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
SourcePackage: firefox-3.1
Uname: Linux 2.6.28-2-ub-generic x86_64