When I click on a tab, every so often (maybe 2-3 times a session), it will unexpectedly pop out to a new window. This occurrence is not like the purposeful downward click to immediately open a new window with the tab, but it is very delayed. In fact when this happens, my mouse pointer instantly jumps to the bottom right of the screen and if I don't move the mouse, the window doesn't open. But, after I move my mouse for a second or two, the tab pops out to the new window. Seems really strange, and can't find an answer anywhere.