[ubuntu-uk] Irritating balloon notifiers

[Rowan Berkeley]

Hi,
Does anybody know a way to switch of the semi-transparent balloon
notifier that appears to say "all downloads complete" and sits there for
ten seconds or so at the top right corner of the screen after a pdf, for
instance, is downloaded from within the Firefox browser? I am not
talking about the downloads window, which is easily switched off in
Firefox. I seem to recall getting rid of this balloon notifier somehow
on the previous build of Ubuntu, but now the only way I can find to
avoid it is to switch off all visual effects in the 'appearance'
preferences, which has the irritating side effect of causing a brief
flash right around the screen when opening the browser.
Thanks,
Rowan