it is obscure, but there on the downloads section, near the bot of the sreen, above the cancel and ok buttons.
the following link explains what this area is SUPPOSED to be for.
when (if) working, it allows you to keep your plugins, but allow you to 'control' them (ie shut flash off) seperately (rather than deleting the plugin).
http://www.mozilla.org/support/firefox/options
i am going to look into to this further because it would be great to control (esp. flash crap).
i know (in opera anyway) that if you tell macromedia to stop playing, it ignores you (ie as far as playing info from the same advertisers, etc).
