My problem:  Suddenly, for no apparent reason, Mozilla Firefox gets hung and will not respond/open pages.  I am not able to click on anything as the mouse-thingie is an hourglass. I have looked for a troubleshooting FAQ, but I haven't found anything helpful yet.  I am not sure I understand the problem and I am too scared/unskilled to do anything beyond rebooting without some confirmation that I am doing the right thing.