In the upper left of the fireFox window are two drop down arrows next to the "Go back/forward one page" arrows. Mighty handy creatures. The main arrows still work, but about two weeks ago, the small drop down arrows stopped working. Have no idea why. Don't recall doing anything different. Any ideas of how to get these working again. Hate to have to hit the "page back" button a dozen times, when once will do. Any response appreciated.