Comment 2 for bug 954583

The button was indeed intended to show downloads while other UI is hidden. However feedback on this proposal suggests it's more useful to dynamically show the bar as needed. And for people who dislike it, the panel can live on as an extension that disables the statusbar. So there's no need for a work-around like this button.

There never was a connection to pop-overs as far as this proposal goes. I suggest to re-consider the button as part of bug #1007227.