Just as book info is displayed in a popup when you hover over a tab, I would find it helpful if the same info displayed in a popup when I hover over the larger icon at the upper left of each pane. The large icon is always in the same place, whereas the corresponding tab can be anyplace in the pane. The large icon is always the same size while tabs can be fairly small and even hidden behind an arrow icon if the pane becomes too crowded. Having a place to zero in on that is a consistent size and location would be helpful to me.
