When I click the Back button, and there are several items in the dropdown history list, seems that I have to hold the left mouse button down for some pre-determined interval before the whole dropdown list is presented. Before this interval transpires, the button appears pressed, but no dropdown list is presented. Is there a configuration variable that sets this minimum time to hold the button down, before the dropdown list is displayed ? If not, is there some other method to have the dropdown list displayed sooner, if not immediately ? This is Firefox 7.0, Windows 7 x64