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When I try to open firefox, it says it is already open and tells me to close it but its NOT open and I want to know how to quit it so I can actually use firefox

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  • 최종 답변자: Petru

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It says that it is open & I need to quit it before I open it again. But it isn't open! How can I quit it so I can open it to use!?

It says that it is open & I need to quit it before I open it again. But it isn't open! How can I quit it so I can open it to use!?

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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.

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Firefox is somehow running in the background - maybe because it didn't shutdown correctly. You can close it using Windows' Task Manager:

  1. right-click the Windows task bar
  2. click Start Task Manager
  3. go to the Processes tab
  4. look for firefox.exe
  5. once you find it, click it and then click the End Process button

Now you can try staring Firefox again. Be careful not to end other processes, though.