This is not strictly a direct method belonging to the Navigator object but it is helpful to remind you about it if you are looking at the Navigator.plugins property.

Calling this method is recommended if you suspect that a new plugin has been installed since the current browsing session was started. Actually, this is likely to happen quite rarely but nevertheless, calling Navigator.plugins.refresh() as a matter of course at the start of your plug-in access script will not cause any undue harm.