I have the same problem. However I have additional information to provide.
When I upgraded to Firefox 14.0.1 I ran live update. This told me - as I expected - that a reboot was required. Unfortunately the reboot failed rather spectacularly. The subsequent attempt at windows repair also failed. However when I powered off and on, it rebooted just fine - but to a version of Windows before the most recent Microsoft security patches. It also reverted to the previous version of Firefox. I have managed to bring the PC back up to date, but now the Norton toolbar remains disabled in Firefox, and live update doesn't offer a new version. Neither does Firefox offer an option to remove the Norton toolbar so that I can get Norton Internet Security to reinstate it.
Now all of this may be irrelevant, but the fact remains that I have now lost the Norton toolbar and can't see a way of getting it back that doesn't require geek-type knowledge of Firefox.
On previous occasions when there were issues you have released a hotfix. Is there a link to a downloadable version of toolbar version 2012.7.4.1 (which I understand is the one required) please?
[edit:Clarified subject.]