Firefox 11 - Not restarting correctly - Profile In Use - Norton Extension Issue

I have the following, which apparently are firefox 11 compatible.

 

Norton Internet Security 2012 (19.6)

 

Norton Toolbar2012.5.2.5

Norton Vulnerability Protection10.1.0.68 - 2

 

Running Windows 64 bit - Professional.

 

If i use restart button firefox 11 doesn't restart hangs.  Have to kill the task through process explorer.

 

If exit firefix then try and restart "Profile in use" and I can see the Firefox process running, same thing as restart need to kill the task through process explorer.

 

Disabled all addons, themes and extensions.  Re-enabled 1 by 1 and the problem is the extension "Norton Vulnerability  Protection10.1.0.68 - 2"

 

Any ideas ?

 

XYZ