Disappearing Menus in Firefox on Windows 7

A few weeks ago the menus in Firefox 16.0.2 on Windows 7 started to disappear.  Like a ghost the menus would fade in and out all the while being clickable.  Very annoying.  The solution was simple - turn off hardware acceleration. Select "Tools/Options/Advanced/Browsing" and toggle off "Use hardware acceleration when available".
Life is much better now that Casper is gone.