Comment 5 for bug 776745

Having roughly 250 pixels (indicator and launcher triangle) out of 2,304,000 pixels (1920*1200 resolution) be a different color than they normally are isn't enough to draw your attention to them unless you happen to be looking in their general area as they change color. Add an additional monitor or two to your setup and it's even more difficult to notice the change.

The shake animation is already in place, having an option to make it play until the user acknowledges the window would be the easiest fix and a good one at that.