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I"x" out of Firefox and when I try to sign back in I get the message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system".

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If I sign out of Firefox, why does it say I still have to close Firefox to get back on? I never have to do anything to close Firefox (it is already closed, of course).

If I sign out of Firefox, why does it say I still have to close Firefox to get back on? I never have to do anything to close Firefox (it is already closed, of course).

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You need to push control alt delete, select task manager, highlight the Firefox process, and click "end" FF gets hung up once in a while. If this happens follow the above to end the fire fox process. Then when you start Firefox again the hang up should be cleared...

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Sounds like Firefox is "hanging at exit". That problem is frequently caused by an Extension or a Plugin. Read all of the following articles.

NOTE: Establish a habit of exiting/closing Firefox with Firefox button > Exit or File > Exit to allow an orderly shutdown of Firefox and closing of all of the files that Firefox has open.


  1. Stop the Firefox process:
  2. Why Firefox may hang:
  3. Use Firefox Safe Mode to find a problem with an Extension or Plugin:


If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.



Not related to your question, but...

You may need to update some plug-ins. Check your plug-ins and update as necessary: