After stopping FF when I restart it , I get a pop up displaying Firefox already running but not responding. Please Help?

There are several possible causes, see [[Firefox is already running but is not responding]].

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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

Get message firefox already running but not responding when trying to launch..tells me to close firefox wondow and try again (no ffox window is open)

When trying to launch Firefox I get the following 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."
This is not the first time and I am tired of having to restart my computer. BTW I have Firefox as my default browser, but had to use IE to get to this support site!
In answer to the next question...every time I TRY to open Firefox.

Simple fix for you I think--it works for me.
1. Open your TASK MANAGER (rt click on your taskbar)
2. Go to PROCESSES
3. Scroll down until you see "firefox.exe"(or anything with the word Firefox in it)
4. Click(highlight) the "firefox.exe"
5. At the bottom right side,click "End Process"
6. Close the Task Manager and do whatever you were attempting to do.
Cheers
Bilk 24

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 is already running but not responding,No process in task manager,Restart and uninstall not useful.Profile manager error

So one day when I opened my mozilla firefox Ive got the "Firefox is already running but not responding.To open a new window,you must first close the existing firefox process,or restart your system."
So I checked my task manager but there is no process,I then checked hours in the internet to find a solution.Yes,I also checked for solutions in this site.Then,I try uninstalling and restarting,it also didn't work,Next I also tried downloading profilemanager and tried to run it but as unlucky as I can be,it also didn't work. Please help :(

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!

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.

Why do I get the message "Firebox already running but not responding"? I have to then restart the computer to get on the internet again.

I go on the internet, the web site works, but then maybe when I try to go to another web site I get a message saying that Firefox is already running, but not responding and I need to close it or restart my computer. I do not know where to go to close that site so have to restart the computer!

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

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.

It always says:Firefox is already running but not responding; what can i do to fix this problem; it has only started after having downloaded the latest verion.

I downloaded the latest version of firefox and the problem has started; it aways says: "Firefox is already running, but not responding. To open a new window you must first close the existing Firefox process or restart your system; I have to do this about 3 times for the internet to come on again; what can I do, short of calling a technician??

Please read this article: [[Firefox is already running but is not responding]]

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 closing FF and then try to go back on, a msg. says FF is already running, but not responding, to open new window you must first close the existing window or restart system. How do i close without restarting?

'This happens after a FF session is ended and am back on my desktop screen. If I then try to go back online a message says that FF is already running but is not responding. To open a new session you must first close the existing process or restart your system. I have to restart the computer to before it allows me to go back on. How can I close the session and then open a new one without rebooting???

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!

When I open Firefox I get the message "Firefox is already running but not responding . . .

I am using Firefox 3.6.9 with Windows XP SP3. Almost every time I try to open Firefox 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."
I then must open Task Manager and find Firefox and stop the process.
I run Firefox on 4 Windows machines and this is the only machine that I have this problem on.
I have looked at the Mozilla Firefox KB and have tried to check on the items that could be causing the problem. I have update my Java in Firefox. I have un-installed Firefox leaving the Bookmark preferences, etc. on my machine, ran CCleaner to clean the Registry of remaining Firefox items and then re-installed Firefox - I still have the problem.
I have installed Google Chrome to fix this problem but now I find that several of the websites and companies I do business with are not compatible with Chrome.
How can I fix this problem? Why am I only having this issue on 1 of my 4 Windows machines?
Thanks!
Bill Artman

For possible causes see [[Firefox is already running but is not responding]].

When I use a GSI external antenna for WiFi I first get a message that "Firefox is already running but not responding etc", and then Firefox crashes. Can anyone help please?

Because of weak WiFi signal I need to use an external antenna (GSI USB wireless WIFI long range network adapter). My computer can see the signal clearly and shows that I am connected to the right network. But when I try to launch Firefox I get a message that "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." When I click "OK" Firefox tries to load websites but gives up and reports "Problem Loading". It looks like Firefox is having trouble "seeing" the signal from the external antenna. What do I need to do please?

Try Ubuntu support, I don't think your problem is with Firefox - it will use the connection that the Operating System "makes". I'm a real noob with Ubuntu myself, and don't think I can help you figure out the problem.
http://ubuntuforums.org/

I open firefox it keeps saying"Firefox is already running,but not responding.To open a new window,you must first close the existing Firefox process,or restart your system" i tried restart my computer...but it's still keep saying that..pls help me..

As I stated above, I have to constantly restart my computer because I get a message stating firefox is already running.

Do you see a firefox.exe in the Task manager if you look there right after you get this error message?
You do not have to restart the computer, just kill that process.
This situation may occur if Firefox was not closed correctly or crashed.

I try to open firefox(i get this message)firefox is already running,but not responding.you must close the existing firefox process,or restart system.I try reboot (no help)I can not find any existing process to close!

When I log on to my wife account (same computer) her firefox opens and preforms just fine. I even unistalled firefox and reinstalled and it does the same thing..

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!

After stopping FF when I restart it , I get a pop up displaying Firefox already running but not responding. Please Help?

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