Stop NSS from loading Norton toolbar in FF

NSS 5.2.2.3 keeps trying to stick the toolbar in my FF installation. It's incompatible with FF also and I dont want or need it. I removed and /or renamed the add-on .dll it puts in the N360_5.0.0.125 folder but NSS keeps regenerating the useless .dll.

 

I tried disabling the safe surfing part of NSS but then it complains that my computer is not protected. It is; I just don't need Norton to keep me away from pfishing sites.

 

How can I stop NSS from forcing a useless program to try to load?