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firefox does not close/exit and must be shut down using task manager


When I "x" out of Firefox, or File menu "exit" or right click to "close," the Firefox window closes but whenever I attempt to restart Firefox, it says that it is already running (hence was never shut down) and I have to use Task Manager to "end process" before re-starting Firefox again. This dilemma only started after upgrading about 6 months ago (can't remember the version). I recently upgraded again but the problem still exists.

Additional System Details

This happened

A few times a week

This started when...

I upgraded to Firefox 5 (I think!)

Installed Plug-ins

  • Google Update
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Next Generation Java Plug-in 1.6.0_29 for Mozilla browsers
  • Shockwave Flash 10.3 r183
  • Google Updater pluginhttp://pack.google.com/
  • 4.0.60831.0
  • RealJukebox Netscape Plugin
  • RealNetworks(tm) RealPlayer Chrome Background Extension Plug-In
  • RealPlayer(tm) HTML5VideoShim Plug-In
  • RealPlayer(tm) LiveConnect-Enabled Plug-In
  • Adobe PDF Plug-In For Firefox and Netscape "9.4.2"
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • iTunes Detector Plug-in
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • Office Plugin for Netscape Navigator


  • User Agent: Mozilla/5.0 (Windows NT 6.0; rv:7.0.1) Gecko/20100101 Firefox/7.0.1

More Information

  • Top 25 Contributor
  • Moderator
251 solutions 3018 answers

Did you check out Firefox hangs or is not responding - How to fix yet?

Question owner

Not yet. I'll check it out. Thanks.

  • Top 25 Contributor
  • Moderator
251 solutions 3018 answers

How did it go?

Helpful Reply

Did not address my issue. Firefox isn't freezing while it's up and running, it just doesn't completely shut down... therefore it's always running behind the scenes.

  • Top 10 Contributor
  • Moderator
10753 solutions 96760 answers

Did you look at the "Hang at exit" section?