After I've closed Firefox and try to re-open it, it'll say it's already running. Have had to re-boot my computer several times a day to get it running again. HELP!!!!

This is a problem that I've been experiencing for the last month. After I've had Firefox open and then close it, when I try to re-open it, it says it's already running, but I have to re-boot my computer to get it going again. I have had to re-boot 5 times just today alone. What's up with that, and how can it be fixed??!!

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

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Hey GreenViking,
You can kill the process manually by right clicking in the task bar (next to the time and date) and opening the task manager.
[https://support.mozilla.com/en-US/kb/Firefox%20hangs#w_firefox-hangs-when-you-quit-it This article] has some information about Firefox hanging when you try to close it.
Hope that helps!

I closed Firefox and tried to re-open it, but I keep getting a message that says "A copy of Firefox is already open. Only one copy of Firefox can be open at a time." Help!

My Mac laptop was working very slowly. I closed it but I can't re-open the version I had. I tried to move it to the trash and download a new version but, I keep getting the same message. How can I get rid of this copy and get back to work????

See:
* https://support.mozilla.com/kb/Firefox+is+already+running+but+is+not+responding

When closing FF 4.0 and trying to reopen on my desktop it says it's already running and needs to be closed to continue ? Happens every time ?!!

Always when I close FF 4.0 on my desktop running XP it says it failed to close correctly and is still running ?
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After closing Firefox, the process continues to run for as long as one minute. If you try to restart during that time, it tells you it's already running. Have no clue why FF4 needs so much time to shut down. That never was an issue with FF3.6.

Firefox was working just fine but the last few days it won't let me open it because it says it's already running but it's not how do I close it to open it?

This is the message I get whenever I click on the Foxfire icon on my computer. Even when it has been down for hours:"Foxfire 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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Sometimes when I close Firefox and try to open it in few moments it shows me 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." However, I haven't opened any additional Firefox related programs, and previous Firefox is closed. First I though it is because of my computer, but then I discovered that other people have the same problem as well
== This happened ==
A few times a week
== some 2 month ago ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; InfoPath.2; .NET CLR 3.0.30729)

Hi Andis.
First of all, this is completely normal behavior, although it's a bit irritating, I know. What happens is that when you close Firefox, despite the window disappearing right there and then, Firefox keeps running for a little bit until the whole closing procedure is completed. This can take a fraction of a second on fast computers, or can take a few seconds on slow computers or when Firefox is storing a large session (if you save your tabs). All you have to do is wait a bit until Firefox closes, and then open it again.
To see if it's still running, you can press CTRL+SHIFT+ESC and then, under the Processes tab, you can see if firefox.exe is still there. If it's taking an unusual amount of time to close (which happens very rarely, and only if the browser freezes on exit), you can force the application to terminate from this application (task manager).
Firefox 4.0 will reduce by 97% the time it takes firefox.exe to close, so this problem will be basically erased for Firefox's next version.
Until then, I can recommend you this extension, which helps you restart your browser more easily and without bothering about closing times:
https://addons.mozilla.org/en-US/firefox/addon/3559/
Hopefully this will help.

When I close Firefox and then try to open it, it says it is already running and I have to close it which I can't do. The only way to open it is to first restart my computer which is a pain. If I can't fix this I will use an other brouser!

I am not sure what more I can tell you. I close firefox. So when I click on the icon it should allow me to open it again but I get a message that says it is already running. Either close it out which I can't do since I already did that or restart the computer.

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After closeing firefox and trying to reopen I get a mesage that firefox is still running and needs to be closed

Each time I close out firefox and try to open it again I get a message the it is still running and needs to be closed. I have to log out to get it to restart

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

Firefox is freezing. When I close Firefox, and try to re-start it, it will not open. I need to access Task Manager, where I find Firefox still running. I close Firefox in Task Manager & can re-start Firefox.

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Sounds like it is hanging when you exit and later try to restart Firefox.
* How to stop the running Firefox process
** In Task Manager, does firefox.exe show in the '''Processes''' tab?
** See: http://kb.mozillazine.org/Kill_application
**Windows 7 users: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
* What may cause Firefox to hang at exit
**Windows 7 Task Manager: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
** http://support.mozilla.com/en-US/kb/Firefox+hangs
** http://kb.mozillazine.org/Firefox_hangs
** https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
* You may need to try Firefox Safe Mode
** You may need to use '''Safe Mode''' to locate the problem: ***See: http://kb.mozillazine.org/Safe_Mode
***Firefox 4 users, hold the Shift key while clicking the Firefox 4 desktop icon to enter Safe Mode.
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****In Firefox 4, Safe Mode also disables Plugins and Hardware Acceleration.
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****When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode".
****Test to see if the problem you are experiencing is corrected.
*** If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it
***#by enabling '''one at a time''' until the problem reappears.
***#You can also enable a few at a time (3-5), keeping track of what you just re-enabled to see if the problem re-occurs; this will help narrow down the possibilities if you have a large number of add-ons.
***#'''You MUST close and restart Firefox after EACH change''' via File > Restart Firefox (on Mac: Firefox > Quit).
***#You can use "Disable all add-ons" on the Safe Mode start window.
**See the following for more information
*** http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes
*** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*** http://support.mozilla.com/en-US/kb/Basic+Troubleshooting
 
 
'''You need to update the following:'''
*Adobe Shockwave for Director Netscape plug-in, version 11.0
*Shockwave Flash 10.2 r152
#'''''Check your plugin versions''''' on either of the following links':
#*http://www.mozilla.com/en-US/plugincheck/
#*https://www-trunk.stage.mozilla.com/en-US/plugincheck/
#*'''Note: plugin check page does not have information on all plugin versions'''
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#**http://kb.mozillazine.org/Testing_plugins
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#*'''Download link and more information''': http://support.mozilla.com/en-US/kb/Using+the+Shockwave+plugin+with+Firefox
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When I close firefox and try to open it later, it won`t open, say it is all ready running but won`t open browser

I close browser , try to open it later and a box comes up an says it is already running and will not open until I reboot,after reboot the same thing happens. I just rembere that prior to this happening some type of undate from firefox came up and ask me to choose which extension or plugins I want and I checked them all , even the ones that where not compatible , maybe this will help but I can`t get the browser up to uncheck them

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

When I close Firefox and try to restart it, my system thinks it's still running, and I must reboot in order to start Firefox 3.6.11.

When I close Firefox and try to restart it, my system thinks it's still running, and I must reboot in order to start Firefox 3.6.11. I'm running Windows Vista and this is the only program that has this problem. Another symptom is the program does not show up in my recently used programs list nor is it in the task list once I've closed it, though Windows will not open it because it thinks it's still running.

I am also using Windows Vista 64 bit and have the same problem..what i do is instead of rebooting the computer press CTRL ALT and DELETE key. start the task manager and go to the Process tab and look for firefox .exe click on it and hit the end process tab. close that window and firefox should run... and this problem started when i upgraded to firefox 3.6.12
If anyone has a permanent solution please post.

When I try to open Firefox, a pop up says it is already running and I must close a window or restart. I can not figure out how to close the window they are asking me to.

when I try to start Firefox, a pop up says it is already running and I must close a window or restart. I can not figure out what window they want me to close
== This happened ==
Every time Firefox opened
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; WOW64; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; MDDC; .NET CLR 3.5.30729; .NET CLR 3.0.30618)

See http://kb.mozillazine.org/Firefox_hangs and [[Firefox hangs]] (Hang at exit)
Check in the Task Manager (XP: Ctrl+Alt+Del, Vista: Shift+Ctrl+ESC, Processes tab) if there are hanging Firefox processes.
If you see any ''firefox.exe'' processes then click the End button to end those Firefox processes.
You can only start Firefox in [[Safe mode]] or launch the [[Managing profiles|Profile Manager]] is all Firefox processes are ended.
See also http://kb.mozillazine.org/Kill_application

After I've closed Firefox and try to re-open it, it'll say it's already running. Have had to re-boot my computer several times a day to get it running again. HELP!!!!

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