Firefox drops a History list every time you hit the Back button. This drop-down disables the scrolling and selection function on the page you have gone back to until you click on that page to dismiss the drop-down. If you are going back to a search results page and want to select the next link, this requires you to click twice instead of once each time you try a link then come back to try the next link. This extension disables this time-consuming behavior. Thanks!!