I have the Firefox extension Flashblock installed, and enjoy the fact that it blocks all Flash (and Silverlight) while still giving me an option to run the Flash content if I want to (e.g. for YouTube). Can I get similar functionality for all plugins, such as QuickTime and Java? I've given addons.mozilla.org a once-over, but nothing grabbed my attention.
I think that, barring an addon, NoScript might be able to help me, but I can't figure out what all the options mean and so don't know what to try.