reassigning to rginda and making myself qa contact. he can reassign to a more appropriate qa contact.
The pref is security.checkxpconnect ("." instead of ":"), but it shouldn't be necessary anymore. Chatzilla runs from a chrome:// url now, and chrome urls get access to xpconnect by default. Unfortunatley, Chatzilla doesn't start up in current builds due to bug 29053. It'll be put back in the tasks menu soon (hopefully for m15.)