Recently I have been having a problem with firefox. Sometimes when I click-and-hold on the vertical scroll bar (left-click), drag up or down, then release, the scroll bar does not recognize that I have released the mouse button. Instead the scroll bar cursor remains selected. If I move the mouse pointer up or down when this happens, the web page will scroll up or down as if I were still in click-and-hold. The browser remains in this mode until I left-click again. At that point the the vertical position jumps to some random point on the web page. It does not matter whether I click on the vertical scroll cursor; somewhere else on the vertical scroll bar; or any other random point on the browser. I cannot control what random point the vertical position chooses to go to. This is something that has just started happening within the past few weeks, and I associate it wit the update to firefox 13. How can I fix this issue?