Firefox updated today. Then I uninstalled Adobe add-in which had been disabled by Firefox previously. I downloaded & installed the latest version of Adobe Flashplayer (26.0.0.151), which Firefox allowed to activate just fine. I later tried to shutdown Firefox (File| Exit) and was unable to do so; clicking the X in upper right hand corner did not work either. I used Task Manager to close Firefox, reopened it and disabled Flashplayer. Firefox still wouldn't close normally. I then loaded Firefox in Safe Mode and then was able to close it using the X from the upper right hand corner... I don't think Adobe caused the problem, but I was able to exit in Safe Mode, which turned everything off. Prior to this latest Firefox update I hadn't had any problem with exiting the browser. Obviously, I can't keep using Task Manager to exit Firefox all the time... I'm at a bit of a loss here.