Q about GPEdit and Software Restrictions

[dredogol]

Alright, I tried to enable software restriction policies on my system:

Enforcement = All Software & All Users (except admins)
Security Levels = "Disallowed" by default.

This worked just fine, until I fired up Firefox after I did this.
After the policy change, my browser disabled my Norton IPS/Toolbar and WoT extensions.
When I return the security level to "Unrestricted", everything worked just fine.

Anyone know where I can make some rule exceptions?
If it's a program exception, I think I can manage, but since it's a plug-in, I have no idea where to look for it.

This is my first time doing these type of restrictions using GP.