Comment 66 for bug 248271

(In reply to comment #57)
> >That's not different from the progress bar at the bottom, though.
>
> OS X and subsequently Vista solve this feedback problem by having their
> progress bars visually pulse even if they are remaining still. (which we don't
> currently pick up since we don't have widget animation yet). But that's the
> best solution to providing the user with feedback+progress. Just feedback or
> just progress isn't as good as the combination of both.

I've made initial state pulse in bug 334697.