Why won't firefox close

Why won't Firefox close properly? When I close the program and then try and restart it, I get an error message which says "Firefox is already open....." I then have to go into the Task Manager to close it down.
How can I fix this problem?
Thanks
Windows, XP on a Dell Inspiron.

See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* https://support.mozilla.com/kb/Firefox+hangs

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Why won't Firefox close, even using Task Manager, unless I right click on the process and select 'end process' ?

Firefox works fine, but won't respond when I try to shut it down. Using Task Manager to 'End Task' doesn't work. In Task Manager I have to right click on firefox in the Processes menu and click 'End Task'. Apart from logging off/shutting down, this is the only method that works. Also refused to respond when I tried to reset and doesn't respond to commands to change profile settings.

SOLUTION (possible).
Hi all. I had this problem as well. I currently run FF26. A week or so ago, out of nowhere FF wouldn't exit - the window would close but firefox.exe process would keep running in the background using about 50% of CPU. Not sure if it's connected, but just prior to that I clicked on a link on Facebook that looked like spam website, nothing happened, site loaded (sort of, all I saw was a msg - Please Wait...) but nothing happened, I have Eset antivirus and it monitors network traffic and files for viruses, so maybe it prevented my PC getting infected...
So, I had this problem for a few days, was searching the net for solutions, but nothing seem to help. Then, just out of luck I did something that WORKED!
Here's what I did. I noticed that svchost.exe was using a lot of CPU alongside with FF. I ran ProcessExplorer to see what might be connected to this process, the list was long and I didn't have any idea where to start, so what I did was - Right click on svchost process, choose Debug and dismiss the warning. In a few seconds svchost process quit and after that FF started closing properly.
I had to re-enable all my plugins and themes I disabled prior, I also lost my history and preferences which I trashed in the process of searching for solution. But heck, it worked, hopefully for good. Now if someone could point out the real cause of this and fix it for everyone - that would be great. Cheers!

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Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
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You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
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Once you "force quit" it shouldn't happen again.
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You got a reply in your earlier thread here: https://support.mozilla.org/en-US/questions/910967

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# In the [[Location bar autocomplete|Location bar]], type '''about:config''' and press '''Enter'''. The about:config "''This might void your warranty!''" warning page may appear.
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# Filter the list by typing in the search bar at the top. Type in ''scanWhenDone''. '''You should now find the "browser.download.scanWhenDone" preference'''.
#Double-click on that preference to set the value to ''false''.
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Hi David,
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There is also the browser.sessionstore.privacy_level_deferred pref that is used when you do not reopen the previous session automatically via "Show my windows and tabs from last time" and uses the same values.
Details like websites remembering you (log you in automatically) are stored in a cookie.
*Create a cookie 'allow' exception to keep such cookies, especially in case of secure websites and when cookies expire when Firefox is closed.
*Tools > Options > Privacy > "Use custom settings for history" > Cookies: Exceptions
You can check browser.sessionstore.* prefs including browser.sessionstore.resume_from_crash on the about:config page and reset browser.sessionstore prefs that are user set (bold) via the right-click context menu to the default value to make sure that Session Restore is enabled and working properly.
*http://kb.mozillazine.org/Session_Restore
*https://support.mozilla.org/kb/restore-previous-session
*http://kb.mozillazine.org/browser.sessionstore.resume_from_crash

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Websites remembering you and automatically log you in is stored in a cookie.
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*Tools > Options > Privacy > Cookies: Exceptions
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*http://kb.mozillazine.org/Cookies
*https://support.mozilla.org/kb/Deleting+cookies
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*https://support.mozilla.org/kb/Clear+Recent+History
Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.
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Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]

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See http://kb.mozillazine.org/Firewalls there a special
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See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]

Why won't Firefox 4 on Mac OSX 10.6.7 quit when QUIT is selected? The window closes, but the application remains open necessitating a forced-quit. Until recently it worked fine. I've reinstalled Firefox but the problem persists.

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Perform the suggestions mentioned in the following articles:
* [[Firefox is already running but is not responding]]
-> Profile in use
* [http://kb.mozillazine.org/Profile_in_use]
Check and tell if its working.

Why won't firefox close

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