netscape.security.PrivilegeManager.enablePrivilege that has been deprecated since Firefox 12, has been disabled. Changing the value of a hidden pref
true can test this feature, but of course it’s not recommended. You should find a workaround like an add-on where privileges are actually required.
Since some sites are still using the
netscape.security object for browser detection, the object has been temporarily restored. From now, use an alternative way to detect browsers.