Firefox keeps hanging up and freezing. I get this message. "Firefox is already running, but is not responding. To open a new window, you must first close the existing--what a mess.

No matter how many times I open and close, firefox hangs up after surfing a few pages. When I look at task master, firefox is using up hundreds of thousands of kb, causing the processor to stall at 100%. I do not have this problem when surfing with IE. I have the latest version of firefox. I never had this problem with version 5. It keeps getting worse with each "update".

See [[Firefox is already running but is not responding]]
Obviously firefox should not hang after surfing a few pages. I have Firefox installed on an XP including firefox 6.0.2 and do not have problems.
See also
* [[Firefox consumes a lot of CPU resources]]
* [[High memory usage]]
Have a read of the above linked articles. The first thing to do is to try to get firefox to behave more normally
#Use [[safe mode]]
#* but do not make changes when you have the window with a list of options just click continue
# if using safe mode does not solve the problem also
#* make sure you use the default theme
#* disable all pluggins
Note by keying in ''about:memory'' into the location bar you will get a report, which includes more info as you roll the mouse pointer over items, that should help indicate where all the memory is being used.

Similar Messages

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    when I launch firefox get the following message "firefox is already running, but is not resonding. to open a new window, you must first close the existing firefox process, or restart your system" firefox not running and a restart doesn't solve the problem

    Download a fresh Firefox copy and save the file to the desktop.
    *Firefox 12.0.x: http://www.mozilla.org/en-US/firefox/all.html
    Uninstall your current Firefox version, if possible.
    *Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.
    Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
    *It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
    *http://kb.mozillazine.org/Uninstalling_Firefox
    Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
    *http://kb.mozillazine.org/Profile_folder_-_Firefox
    See also:
    *https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding
    *http://kb.mozillazine.org/Profile_in_use
    *http://kb.mozillazine.org/Recovering_a_missing_profile

  • When i close firefox and then attempt to restart it i get the following message. firefox is alreadt running,but is not responding to open a new window.you must first close the existing firefox process or restart your system.

    i have to restart

    Sounds like Firefox is "hanging at exit". That problem is frequently caused by an Extension or a Plugin. Read all of the following articles.<br /><br />
    #Stop the Firefox process:
    #*[http://kb.mozillazine.org/Kill_application Mozillazine - Kill application]
    #*Windows 7 users click [http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576 here]
    #*Mac users: http://techheavy.com/2011/02/the-mac-task-manager/
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    #*[http://support.mozilla.com/en-US/kb/Firefox+hangs Firefox hangs] (see Hang at exit)
    #*[http://kb.mozillazine.org/Firefox_hangs Firefox hangs (Mozillazine)] (see Hang at exit and Closing Firefox properly)
    #*[https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding Firefox is already running but is not responding]
    #Use Firefox Safe Mode to find a problem with an Extension or Plugin:
    #*Don't check anything when entering Safe Mode, just continue
    #*If the problem does not occur in Safe Mode it is probably and Extension or Plugin causing the problem
    #*See:
    #**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
    #**[http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
    #**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
    #**[http://support.mozilla.com/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
    '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''
    Not related to your question, but...
    You may need to update some plug-ins. Check your plug-ins and update as necessary:
    *Plug-in check --> http://www.mozilla.org/en-US/plugincheck/
    *Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.com/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox]
    *Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.com/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]
    *Shockwave Flash (Adobe Flash or Flash): [https://support.mozilla.com/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox]
    *Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

  • I often get this message. Firefox is already running but is not responding.To open a new window you must first close the excisting Firefox process or restart your system.Thankyou Colin.

    So this message appears mainly if I were changing web sites.Can't carry on until I have cleared everything from screen,gone on to my Thunderbird e-mail then Firefox will load again.I can then just carry on till next time.

    Please look at [[Firefox is already running but is not responding]]
    The initial problem is solved by killing any process firefox.exe, ( & maybe also plugincontainer.exe) Make sure you always close firefox by using the option Firefox Button -> Exit
    You may need to investigate further and clear some of the duplicated files that may exist.

  • When I try to accessFirefox, I get a message that says Firefox is already running ,but is not responding.To open a new window,you must first close the

    I get this message when I click the icon on the desktop or open a webpage from O.E.

    Make sure that you do not start Firefox with the -no-remote switch appended to the command line.
    * http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile
    See also:
    * http://kb.mozillazine.org/Profile_in_use
    * [[Firefox is already running but is not responding]]

  • 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 get a message that says ff is already running but is not responding ,to open a new window, you must close the existing ff process or restart your system, how do i close the existing ff process?

    I have windows 7 on dell laptop. I am working on a Word Document and want to go to a diff window for some information. I click on the FF icon on my desktop and get a message that says...FF is already running but is not responding. To open a new window, you must close the existing ff process or restart your system..how do you close the existing ff process?
    == This happened ==
    Every time Firefox opened
    == I got my new dell laptop four weeks ago with window 7 installed

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

  • I keep getting this message after closing Firefox and attempt to reopen-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 keep getting this message after closing Firefox and attempt to reopen-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.

    See:
    * http://kb.mozillazine.org/Recovering_a_missing_profile
    * http://kb.mozillazine.org/Profile_in_use

  • Why does firefox stop loading then when i close it and try to open it up again I keep getting this 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

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    For possible causes of this error, and how to troubleshoot it see [[Firefox is already running but is not responding]].

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    == User Agent ==
    Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB6.5; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET CLR 3.0.04506; InfoPath.2; Media Center PC 5.0; SLCC1)

    <u>'''Kill Application'''</u>
    In Task Manager, does firefox.exe show in the <u>'''Processes'''</u> tab?
    See: [http://kb.mozillazine.org/Kill_application Kill Application]
    '''<u>Causes and solutions for Firefox hanging at exit:</u>'''
    [[Firefox hangs]]
    [http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit Firefox hangs at exit]
    [[Firefox is already running but is not responding]]
    <u>'''Safe Mode'''</u>
    You may need to use '''[[Safe Mode]]''' (click on "Safe Mode" and read) to localize the problem. Firefox Safe Mode 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 <u>'''before'''</u> 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 Plug-ins and then try to find which is causing it by enabling <u>'''one at a time'''</u> until the problem reappears. <u>'''You MUST close and restart Firefox after EACH change'''</u> via File > Restart Firefox (on Mac: Firefox > Quit). You can use "Disable all add-ons" on the Safe mode start window.

  • Keep getting this 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." , but cannot view Firefox open window or close it. Have to always reboot system.

    Keep getting this 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, cannot view open window or close Firefox. Have to always reboot system to access the internet.

    For possible causes of this error, and how to troubleshoot it see [[Firefox is already running but is not responding]].

  • When I click to open firefox it says 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" and I've tried to shut down and restart my computer but it keeps

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    == This happened ==
    Just once or twice
    == I was on facebook trying to upload pictures yesterday. ==
    == User Agent ==
    Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0; InfoPath.1)

    Do you have a profile lock file in your profile folder? If so, delete it and see if TB runs properly:
    http://kb.mozillazine.org/Profile_in_use#Remove_the_profile_lock_file

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    == This happened ==
    Every time Firefox opened
    == IDK

    This began to happen to me when I tried to run two separate profiles simultaneously on the same installation of firefox with -no-remote

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    I get this message when I try to start Firefox after first logging on after turning on the computer.
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    Firefox is "hanging at exit" when you exit/quit Firefox.<br /><br />
    #Stop the Firefox process:
    #*[http://kb.mozillazine.org/Kill_application Mozillazine - Kill application]
    #*Windows 7 users click [http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576 here]
    #*Mac users: http://techheavy.com/2011/02/the-mac-task-manager/
    #Why Firefox may hang:
    #*[http://support.mozilla.com/en-US/kb/Firefox+hangs Firefox hangs] (see Hang at exit)
    #*[http://kb.mozillazine.org/Firefox_hangs Firefox hangs (Mozillazine)] (see Hang at exit and Closing Firefox properly)
    #*[https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding Firefox is already running but is not responding]
    #Use Firefox Safe Mode to find a problem with an Extension or Plugin:
    #*Don't check anything when entering Safe Mode, just continue
    #*If the problem does not occur in Safe Mode it is probably and Extension or Plugin causing the problem
    #*See:
    #**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
    #**[http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
    #**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
    #**[http://support.mozilla.com/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
    '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''

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    == This happened ==
    Every time Firefox opened
    == today ==
    == User Agent ==
    Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; MDDS; InfoPath.2; .NET4.0C; AskTbUT2V5/5.8.0.12304)

    <u>'''Kill Application'''</u>
    In Task Manager, does firefox.exe show in the <u>'''Processes'''</u> tab?
    See: [http://kb.mozillazine.org/Kill_application Kill Application]
    '''<u>Causes and solutions for Firefox hanging at exit:</u>'''
    [[Firefox hangs]]
    [http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit Firefox hangs at exit]
    [[Firefox is already running but is not responding]]
    <u>'''Safe Mode'''</u>
    You may need to use '''[[Safe Mode]]''' (click on "Safe Mode" and read) to localize the problem. Firefox Safe Mode 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 <u>'''before'''</u> 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 Plug-ins and then try to find which is causing it by enabling <u>'''one at a time'''</u> until the problem reappears. <u>'''You MUST close and restart Firefox after EACH change'''</u> via File > Restart Firefox (on Mac: Firefox > Quit). You can use "Disable all add-ons" on the Safe mode start window.

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