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!

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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.

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]]

Every time I try to load firefox, WindowsXP says firefox is already running but not responding and before it can load another I have to shut down the one running and reboot my computer.

My problems started when I downloaded Ilivid downloader, after I loaded the program and watched the short video the program started messing up my computer. It spread itself all over my hard drive, changed my homepage, my search engine, locked me out of being able to change certain settings, made some of its files undeleteable and since then my firefox will not load. I removed my version of firefox and reinstalled it several times. I still got the same response. I went into the registry and deleted all references to Mozilla and Firefox and reinstalled it again, same response. I spent days trying to delete all references to ilivid downloader and every file I could find that made any reference to ilivid. I hope you can help me with my problem. I like using firefox and would like to start using it again. Thanks

See
* [[Firefox is already running but is not responding]]
Try closing any running instances of ''firefox.exe'' (and plugincontainer.exe) using something such as Task Manager. That should allow you to then restart Firefox.
As for iLivid. Possibly it also has associated apps or extensions with names not including the word iLivid. Looking at their own FAQs there are instructions to remove iLivid using the Windows Control panel, and mention of other bundled software that you may wish to remove. It seems it is more of a nuisacne rahter than out and out malware.
* see http://www.ilivid.com/faq.htm (page scrolls for more info) but includes:
How do I uninstall the software?
The software can be removed in a simple was like any other software:
Go to the Windows Start menu and then to Control Panel > Add/Remove ("Programs & Features" in Vista & Windows 7) and click "Remove" next to the software name (e.g iLivid Download manager / Windows iLivid Toolbar ).
During the installation bundle software are offered, each can easily be removed following those instructions: Uninstall Yontoo Addon , Uninstall Search Toolbar (powered by Bing) or Uninstall Babylon.

Firefox is not opening and saying " firefox is alredy running but not responding ,to open a new window you must close the existing fireox process" even though there is no other window open

this has been happening since i updated i have windows 7 but firefox beta used to work just 3 days ago i had mcafee site advisor but i deleted it its not working every time i click on the icon it displays the above message

I discovered that when the "Firefox is already running . . . ." message pops up I can fix it by doing the following [note: I get the same message for the Thunderbird e-mail program too] : 1. I open 'TASK MANAGER" and click on the "Processes" tab. 2. Next I scroll down until I see Firefox.exe *32 in the leftmost column (or Thunderbird. exe *32 if the message came up there), highlight that line by clicking on it and then click on the "end process" button on the right side on the bottom. 4. A pop-up window will come up but ignore its message and click on the "end process" button in the pop-up window. The program should then start the next time you click on the icon..
While that saves the need to restart your PC to fix the problem, I have yet to find any information as to the reasons for those two processes to show up in the first place. I'm running the 64 bit Win 7 Professional and do not know if that has something to do with those two processes running from time to time or not. The message comes up often but not all the time and I haven't been able to pinpoint any action on my part where the message comes up if I do '''X '''or the message never comes up when I do '''Y''' before closing Firefox or Thunderbird.

When not on Firefox and go to do it, why am I constantly getting: "Firefox is already running but not responding. To open a new window you must close the existing Firefox process, or restart your computer." Moreover, HOW CAN I STOP IT FROM HAPPENNING???

Every time I have to re-start my computer I need to stop my work. It would sure be nice if you can tell me how to keep this from occurring.
Thank you.

Sounds like Firefox isn't closing down completely when you exit it. 
https://support.mozilla.com/en-US/kb/Firefox%20hangs See '''hang-at-exit'''

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.

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.

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

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 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?

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

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]].

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/

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

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?

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