When clicking the pop-up button on the history back button in a browser window, a drop-down list shows all the previous pages correctly. When the mouse moves away, the drop-down does not time out. You must either clickt he pop-up icon again or hit the Escape key. If you minimize the page (such that it shrinks to the doc), the drop-down will not go away even if you hit the escape key. The only way to hide the drop-down is to give the original browser window that was clicked on focus again.
This is a duplicate of 117369. *** This bug has been marked as a duplicate of 117369 ***