Firefox 12.0 Mac OS 10.7 and NSM - add-on disabled

Firefox 12.0 Mac OS 10.7 and NSM - add-on disabled

 

All installed as suggested. I logon as child account. Search in firefox is restricted by NSM, eg. can't clikc on a gambling site.

Go to add-ons diable NSM add-on. restart firefox. GAmbling sites and other restricted sites now avaiable.

Have read on other posts that NSM still blocks sites even when add-on disabled but categorically not the case here. Turning off NSM not very hard for any inquistive child.

I have unsinstalled and re-installed NSM. Is there something I am missing here....?