When I close Firefox by clicking on X in the upper right corner of Vista, Firebox doesn't close and the next time I click on FireFox I get a message that FF is still running but not responding. I use alt,ctlr,delete to use Task Manager to close FF. Why?

The details are in the question. Don't know what else to add.

https://support.mozilla.com/en-US/kb/Firefox%20hangs (See '''hang-at-exit''')

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When I try to start Firefox, I get a message that it is already running but not responding and I can't run another Firefox at the same time. I uninstalled and reinstalled. No change. Tried various other suggestions. Help!!

When I try to start Firefox, I get a message that it is already running, but not responding and that I should close it before trying to run another Firefox. But I cannot find a way to close Firefox program that is not running as far as I can see. I tried uninstalling and reinstalling Firefox, but that did not work. I've tried various other things, but no luck. I thought programs should stop when the computer is turned off, but that didn't work either.

How are you opening the Profile Manager?
*http://kb.mozillazine.org/Profile_Manager
Sounds that Firefox is still or already running. 
See:
*http://kb.mozillazine.org/Kill_application

I will think that I have closed Firefox, I will go to open it again and I will get a message that it is still running on my system and my system must first be restarted. I am using a special Laptop desk for it. Sorry so long.

I've been on it a bunch lately, plus I tend to watch a lot of movies, back to back, streaming, from Netflix. My laptop was hacked so badly that it was taken back to factory settings and I now use Glary Utilities and CCleaner every two weeks. I use AVG as antivirus. Monthly I run Glary, CCleaner, Malwarebytes' Anti-Malware, Disk Cleanup and Dfrag.
I haven't given my computer a break to breathe. I've been updating my information, like I said already, on all those websites, which is like neverending.
I do have to use Internet Explorer for some things, but Firefox has actually been staying open on my system a lot more than Internet Explorer has been crashing. And I swear, there are no indicators to me, other than opening up Task Manager, I suppose, and I haven't done that, that Firefox is staying open. It truly is looking totally closed. Yet my laptop is giving me this weird message stating that it isn't, so I click Restart, and open it again, then go on my merry way with my work in Firefox.
I have no idea how to tell if my plug-ins are old or not cooperating with my current, updated version of Firefox.
Can somebody dummy their answer down, please? I will give you more details if you ask for them. I don't know what other details to give. I did read through the other options, and this is what fit me the best, I thought. Who knows. Thanks, Tigerstripe

The proper way to close Firefox is through the File menu "Exit" or the equivalent with the Firefox button.
More detail in item '''#38 Firefox already running '''
of
[http://dmcritchie.mvps.org/firefox/firefox-problems.htm#fx4interface Fix Firefox 4.0 toolbar user interface, problems (Make Firefox 4.0 look like 3.6) (#fx4interface)]
Firefox already running, to properly shutdown Firefox when closing the last window use File → Exit/Quit (or Firefox button → Exit). Closing Firefox with the [X] in the upper right corner closes the window ("Ctrl+W") but that does not necessarily close Firefox if it has subtasks running. If you want to close and reopen Firefox use the "Restart" within Add-ons if you made a change requiring a restart, or install "[https://addons.mozilla.org/firefox/addon/restartless-restart/ Restartless Restart]" ("Ctrl+Alt+R") which will allow you to take Firefox down and restart without having to check the Windows Task Manager to see if Firefox first actually ended. [http://kb.mozillazine.org/Firefox_hangs Firefox hangs]

After I close Firefox, if I try to re-open weithin about 1/2 hour, I get a message " Firefox is still running but not responding". How do I fix this?

The question is all there is!!

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

I have the problem described in /forums/knowledge-base-articles/704725. (Firefox is already running but not responding). My only solution is to use Task Manager to end the firerfox process. I am the only user and there are no other profiles on my system

Occasionally I have the problem discussed in /forums/knowledge-base-articles/704725 , Firefox is already running. My only fix is to use Task Manager to end the firefox process. At such tmes, I have no other instances running.

'''https://support.mozilla.org/questions/997866?esab=a&s=&r=1&as=s'''. 
This is not a cure but will make it easier if Firefox locks up.

I close out Firefox then when I try to reopen it, I get a message that it is still running. I've had so many bugs with Firefox that I'm removing it and going back to IE.

The problems I've had with Firefox are numerous. It keeps running in the background and won't reopen. I have to go to the task manager and close it manually. Now, it won't load my iGoogle homepage. I was loading fine, earlier but now won't. My other browsers work fine. There are just too many bugs here.

For more information see [[Basic Troubleshooting]], under
'''4. Restart Firefox in Safe Mode'''

Long after logging off, when I try to log on again I am told firefox is still running but not responding.

That just about says it,

https://support.mozilla.com/en-US/kb/Firefox%20hangs See '''hang-at-exit'''

Firefox won't close. When I shut it down, the window closes, but I can't reopen it. I get a message that it is still running. When I shut down my PC, I get a message that Windows can't shut down Firefox.

The question pretty much details my problem. I have to force a shutdown of Firefox and reboot to be able to browse again.

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

On switching on, a message says 'Firefox is already running but not responding...........' then tells me to close it and restart but how can I close it when the page isn't yet displayed?

When I switch on my computer I get the desktop then I try to click on Mozilla Firefox but get the message, 'Firefox is already running but not responding. To open a new window you must first close the existing Firefox process or resart your system.' I looked up how to close but I need to click on 'file' then 'exit'. How can I do that when I can't see the page yet? IE is working fine.

See also [[Firefox is already running but is not responding]]

Firefox stops loading new pages, displays "Loading". When I close it it goes. But when I restart it gives me "Another version is running, but not responding. This requires a power cycle reboot.

Version 3.6.18. Running on Windows XP Pro. (kept current)
This happens on a variety of pages. I get the little Loading thing in the tab, with the circle moving. So I X out (to exit Firefox). When I go to restart I get the error message "Another version of FireFox is running, but not responding". I give Windows the "three finger salute", and go to Task Manager, and do not see any reference to Firefox, and the Performance, and Processes seem OK. But it never seems to close the earlier Firefox, and won't let me open a new one. Any suggestions? Super Thanks for your help!

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.

Once I turn off the browser and then try to use it later, I get a message saying its already running but not responding. tells me to close it which I cant do since its already closed. Forces me to restart my computer

Each time I start, use and close Firefox, when I try to use it the 2nd time, I get a message saying its already running but not responding. It Isn't. I have to restart my computer everytime I want to use Firefox.
== This happened ==
Every time Firefox opened
== I downloaded the new version ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; Win64; x64; SV1; GTB6.4; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

'''Kill Application'''
In Task Manager, does firefox.exe show in the '''Processes''' tab?
See: '''[http://kb.mozillazine.org/Kill_application Kill Application]'''
'''Causes and solutions for Firefox hanging at exit:'''
'''[[Firefox hangs]]'''
'''[http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit Firefox hangs at exit (Mozillazine article)]'''
'''[[Firefox is already running but is not responding]]'''
'''Safe Mode'''
You may need to use '''[[Safe Mode]]''' (click on "Safe Mode" and read) to localize the problem. Firefox SafeMode is a diagnostic mode that disables extensions and some other features of Firefox. If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes before starting Safe Mode. 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.
See:
'''[[Troubleshooting extensions and themes]]'''
'''[[Troubleshooting plugins]]'''
'''[[Basic Troubleshooting]]'''
If the problem does not occur in Safe-mode then disable all of your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. You have to 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.

I can't open firefox the running but not responding window opens and says to close the existing window. I can't do that shutting down the computer doesn't do anything to help. I've done all the suggestions here. I've uninstalled and reinstalled firefox

Firefox will not open. I get the firefox is already running but not responding window... I have tried rebooting with no help. I have tried to end the process via cntrl+shift+esc and nothing firefox is listed to end. I have tried find the app data via the run icon in the start up window, I have no run icon on this system (Acer with windows vista(?)
== This happened ==
Every time Firefox opened
== The computer was hard shut down and did a improper shut down scan when it was restarted ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; FunWebProducts; GTB6.5; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729)

I am having a similar problem. Running Xp.
Latest revision of firefox.
After using firefox for a while if I exit, parent.lock is locked and i have to reboot to reload firefox.
I have killed all firefox applications from task manager (usually there are none). and I have tried 3 different "file unlock" programs including unlocker to no avail.
I also recently installed a program that shows -all- open files, and parent.lock is not listed, and thus not closable/unlockable from there.

Firefox 29.0.1 on Windows 7 (64-bit): ALWAYS get "Firefox is already running but not responding..." error and need Task Manager to close/restart Firefox.

I run Firefox 29.0.1 on Windows 7 (64 bit) and I get the "Firefox is already running but not responding. In order to open the program you must close the existing window." error. EVERY TIME I try to start Firefox. The posted solution works to start the program, but it is not a permanent solution. I go through the Task Manager and end the old Firefox process, then I can open a new window. While working, I can open multiple tabs and multiple windows, everything seems to (usually) work the way it should. Then after I completely exit Firefox, in order to open the program again I need to fix the SAME error again. Every time. It doesn't seem to hurt anything really, but it is quite annoying.
I used to get this same error on some of the older Firefox versions but it was only once in a while. With the new 29.0.1 it is literally EVERY TIME I TRY TO RUN FIREFOX!!!!
So, down to the big question: is there a permanent fix for this yet? Or will there be one included in the next version update? Or am I going to have to go back to Internet Explorer? I know I am not alone in this experience; i've seen several other users posting similar questions but none of them received satisfactory answers. So what's the story here, team Firefox?

'''https://support.mozilla.org/questions/997866?esab=a&s=&r=1&as=s'''. 
This is not a cure but will make it easier if Firefox locks up.

I am connected to the internet and I close all tabs on the screen. Now I want to open a new tab, but Firefox opens a pop-up window stating"Firefox is already running, but not responding . To open a new window, you must first close the existing Firefox pr

I am connected to the internet, but all tabs are closed. Now I want to open a new tab, But Firefox pops-up with "Firefox is already running, but not responding. To open a new window, you must first close the existing Firefox process, or restart your system". Does anyone here know how to fix this? Thank´s, BL.
== This happened ==
A few times a week

Firefox is shutting down windows I want to remain open. Example: I am done viewing one window. I click the X to shut the window and it shuts two windows. Every single time, attempt to close one windows, two windows close. Lately, I have been opening several windows with nothing but google search, just so it will shut that window and not something else I want to remain open. I could understand this if I was using tabs, but I am not. This has been going on for over two weeks. I don't like going back to history to open a window, I did not want closed in the first place. Isn't that what 'Windows' is all about? Any ideas?

I have the latest version but I am continually told that Firefox is running but not responding and that I need to close Firefox or restart my computer to clear the problem. Why is this happening?

I have the latest version but I am continually told that Firefox is running but not responding and that I need to close Firefox or restart my computer to clear the problem. Why is this happening?

See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
*https://support.mozilla.com/kb/Firefox+hangs
See also:
* http://kb.mozillazine.org/Profile_in_use
* https://support.mozilla.com/kb/Firefox+is+already+running+but+is+not+responding

When I close Firefox by clicking on X in the upper right corner of Vista, Firebox doesn't close and the next time I click on FireFox I get a message that FF is still running but not responding. I use alt,ctlr,delete to use Task Manager to close FF. Why?

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