well, through my knowledge to firefox addons, there are no such precision with those flash/ads blocking addons, if you can do coding, maybe you can write one. well, if you have not tried flashblock, you can try it. it will block all the flash elements in one webpage, but not simply stop displaying, it replaces them, you can simply re-enable a flash element through a simple click. but please remember, this may cause cookie problem, so it is not that perfect. so for now, i have same need like you, buddy, but i really do not find one that suitable.