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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• I have message handler 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. It is NOT open I onlly have a computer

  I installed FF on my new computer, Windows 7 Toshiba, 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. It is NOT open I have only one computer.
  I had a computer scientist to try everything, and we cannot on it to open it.

  Search the firefox process firefox.exe and kill him with for example the Task Manager. It is also worth watching for the plugincontainer.exe.

  The problem and the solutions are explained in the articles:

  • Error message "Firefox is already running but is not responding" - how to fix
  • Firefox crashes or does not - how to fix

• I keep having a problem with this error 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've tried everything.

  I keep having a problem with this error 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 tried everything the internet suggested but it continues to wreak havoc... Help, please... John.I cannot give other details that it has become very annoying

  See "hang out":

  • http://KB.mozillazine.org/Firefox_hangs
  • Firefox crashes or does not - how to fix

• 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 restart the system, this message reappears when I open firefox every time.

  I disconnected and then reconnected in. I clicked on turn off computer on the start menu and restarted the computer. I click on the computer of the off-ramp in the start menu and turns off the computer. I went to a computer point of restoration, and there have been no changes to the computer. I turned off my modem and rebooted. After all that I turned off the power strip and the power to all components. I restarted their in the sequence of the Internet by modem, monitor, CPU. Since that time I have not turned on my speakers to my printer

  Create a new profile as a test to see if your profile is at the origin of the problems

  See basic troubleshooting: a new profile

  If this new profile works then you can transfer files from the old profile to the new profile (be careful not to copy corrupted files)

  See http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

• Thunderbird is already running but is not responding. To open a new window, you must close the current Thunderbird process, or restart your system.

  Thunderbird doesn't start and gives this message in a message window

  Thunderbird is already running but is not responding. To open a new window, you must close the current Thunderbird process, or restart your system.

  Any help would be appreciated.

  See:

  • http://KB.mozillazine.org/Profile_in_use

• Firefox is already running but is not responding. The old process of Firefox must be closed to open a new window.

  When I try to open Firefox, I get this message:
  "Firefox is already running but is not responding. The old process of Firefox must be closed to open a new window. »
  I then clicked close firefox, but the problem was solved not so I uninstalled and reinstalled firefox, but it's the same thing.
  At this point, I went to support Mozilla and tried the steps described in the article, "Firefox is already running but is not responsible for - How to fix error message", but the firefox.exe process was not in the processes tab in windows Task Manager. While he was in the Details tab, when I tried to put an end to the process, I received this message:
  
  "The operation could not be completed. Access is denied. "

  What can I do to fix this?

  Thank you.

  Usually when you stop and restart Windows, Firefox is not running and can be started normally.

  Firefox is set to start automatically with Windows? Microsoft has a utility to investigate what is set to happen at startup: https://technet.microsoft.com/en-us/sysinternals/bb963902.aspx

  It is possible that something is triggering a process in your default browser and it is the hanging of Firefox. You can try to change your default browser to IE (IE can offer to do when you start) before the shutdown and restart Windows to see if it makes a difference.

• Firefox is already running but is not responding? Simple answers don't seem to work

  I started Firefox earlier today and received a message about a problem with Firefox and he had to be reset. Because the other option seemed worse than the reset, and Firefox Reseting seemed relatively painless, I clicked OK. A short message popped up on the registration of passwords, bookmarks, etc. with success. Then a small window pops up, saying it was cleaning of Firefox. While the process seemed to freeze. I liquidated it, killed at any process of firefox running and attempted to restart Firefox, when I received the message "Firefox is already running, but does not." There is a folder on my desktop labeled 'old Firefox data' which I assume is from Firefox reset (it is also now a copy of the profile on my desk, just in case).

  https://support.Mozilla.org/en-us/KB/Firefox-already-running-not-responding

  I found this and tried to work through it, but it doesn't seem to help.

  (1) Ther' are no Firefox.exe in my task manager, nor is there a process plugin-container.

  (2) I deleted the file "parent.lock" in both the profile (which is just a bunch of jumbled letters and numbers with 'default' in it) and the record of the old Firefox. However, these files were just "parent.lock" not "parent.lock.parentlock".

  (3) did not change the name on it, so unless the reset did before she locked herself, I don't know what to change it to.

  (4) it is not a file share, so...

  (5) this could be a possibility. The folder of Firefox that my profile is 'Read only' is, but I can't not to change cela. Everytime I go in, turn off the 'Read only' option and tell him to propagate the change through subfolders, it seems to work, but when I check the properties 10 seconds later, 'Read Only' is checked again.

  Sounds that the profiles.ini was corrupted when you remove the old default profile and adding the new profile.

  • http://KB.mozillazine.org/profiles.ini_file

  You can have security software that preventing to change the Firefox file.

  You use the Profile Manager to restore an existing profile or create a new profile.

  A "Reset" creates a new default profile with a timestamp attached and is trying to import some settings of the old profile, leaving the old profile intact, including the (invalid) cache folder (topic: cache) can take up to 1 GB.

  • http://KB.mozillazine.org/Profile_folder_-_Firefox

  Versions of Firefox 15 + will move the old profile folder "old Firefox Data-#" folder on the desktop that gets a figure if you use reset several times, so you can no longer use the Profile Manager to return to the old profile.

  See also:

  • http://KB.mozillazine.org/Profile_Manager
  • https://support.Mozilla.org/KB/managing+profiles
  • http://KB.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows

• I get a message "Firefox is already running but is not responding.". I did everything here Inc. uninstalled and re-installed. Help!

  I am using a HP desktop computer with Vista Home premium. I get a "Firefox is already running, but does not." message. I did everything on the other forums and it did not help. I even uninstalled and reinstalled Firefox. I still get the same message.

  You are able to start Firefox in Safe Mode or start the Profile Manager?

  (1) safe Mode

  It is a standard diagnostic tool to disable some advanced features of Firefox and extensions. More info: questions to troubleshoot Firefox in Safe Mode.

  You can start Firefox in Safe Mode by holding down the SHIFT key when you start Firefox. (If you get directly in a new window, you must exit all Firefox Windows first).

  A small dialog box should appear. Click on 'Start mode safe' (not reset).

  It will start?

  (2) the Profile Manager

  This assumes that firefox.exe is not running.

  Start in Manager profiles using Start > Search box (or run):

  firefox.exe -P
  

  When you get the Profile Manager window, do not delete anything!

  No matter what time you want to switch profiles, you exit Firefox and return to this dialog box.

  If you select your default profile and click Start, Firefox start?

• Firefox says it is already running, but is not!

  Error message states: "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 checked the Task Manager and nothing to do with firefox is running.

  I rebooted and no effect.

  I uninstalled and reinstalled to no effect. no virus I know

  Maybe your xxxxxx.default folder is removed.

• Firefox is already running but is not responding

  None of the suggested solutions work. I tried the following (not in the actual order) / useful information:
  -Restart Windows problems, it is just a fluke
  -Ran memory many comparative tests in order to check the hardware. 0% errors of memory.
  -Having applications and latest drivers (i.e. Flash) always updated to the latest stable version
  -File deleted parent.lock
  -Make sure that the profile folder (and subfolders) are not read-only
  N ' I 4 extensions and always the latest versions (AdBlock Edge, DownThemAll, Garmin Comm., Pocket)
  -Completely uninstalled Firefox w / profile deleted and clean installed different versions of 29.0b1 post and problem returns after many sessions.
  -Came back to version 28 (clean install and non-clean install downgrade) and the error does not occur for 2 days of trial period.

  Check
  https://support.Mozilla.org/questions/997866?ESAB=a & s = & r = 1 & s = ACE

• Firefox error message is already running but is not responding"- how to fix

  I don't know where to post this. But after trying everything from this site, I came to my own difficulty.

  This stopped the bad closure of the problem in Firefox [please forgive my lack of computer terms]

  1. 1 Firefox uninstalled and reinstalled and it still not has not correctly restart
  2. 2 Start menu [% APPDATA%\Mozilla\Firefox\Profiles\] and delete all the files in firefox
  3. Firefox 3 uninstalled and reinstalled again
  4. 4 start [firefox.exe - p] menu and deleting profile information and created a new profile
  5. 5 open Firefox right click for the Menu bar
  6. 6. Select Tools

  First off I change my home page and I unchecked all tab buttons [I don't like tabs]

  1. Privacy 7 tab

  Check-[say I have no desire to be the subject of a monitoring of the sites] [may be optional]
  Check-[don't forget history never] * and restarted firefox
  Location Bar - check - or selection-[nothing] [may be optional]
  and then you click ok

  Then I tried again my old setting [to use the custom settings for history]
  When I changed him [never remember history] to [use the custom settings for history] and restarted firefox.

  I attempted to try this and all the restart problems popped up again
  

  Note Please
  It could not be canceled. Attempt to change [use the custom settings for history] to [do not forget history never] would not correct the problem of blocking, so I had to start all over again from the beginning. And that worked.

  I have lost my favorites in reset, but I'll live with it!

  I restarted 20Fois without a failure where it was two or three times. Thus, it seems to work now.
  Sorry for my wrong message above capacity. As I get older my attention to detail seems to fall a little.

  On top of that it is.
  I started on page [options] and with each page that I changed, I clicked Yes and closed. Then checked for a reply in Firefox.
  Everything worked fine until I got to the Privacy tab.

  Yet once again, I'm sorry for my crappy writing.
  Maybe you smart people can find a way to solve this problem, without loss of data.

  Good luck gwinslo

  Thanks for your reply FredMcD

  My post above was a good solution for me. With no other closing issues.
  I took my dose with a reinstall of my Bookmarks, etc. of my Norton Back up.
  Everything seems to have been fixed, with over 35 restarts so far this afternoon.

  Thanks for all the info.

• Firefox is already running but is not

  I started my computer and I tried to open firefox but a windows appears and say Firefox is already running, but does not. To open a new window, you must close the existing windows, and try again.

  The problem is that he is not running. I opened my task manager and there are no programs running, I have check the processes running and nothing to do with Mozilla firefox is here. How can it already be running if it is not open?

  I actually fixed. I was looking for in c:\users/myname/appdata/local/mozilla/firefox/profiles

  I looked in
  c:\Users/MyName/appdata/roaming/Mozilla/Firefox/profiles and found the profile.locked file and deleted. Works fine again.

• Error Microsoft Life Cam "a later version of the Webcam Live software is already installed, to reinstall the life CAM software, you must first uninstall the CAM of your computer software."

  Dear Mircosoft
  I just bought the Microsoft Live Cam VX-2000.  You are able to help.
  I followed the installation, then at the end when the picture came on the screen an error message came on the screen: "a later version of the Webcam Live software is already installed, to reinstall the Webcam Live software, you must first uninstall the software of Webcam Live from your computer."
  I'm not very user-friendly computer.
  I get a green flashing on the camera.
  I can't use it in Skype.
  Thank you
  JO Smith

  Hi josmith416342,

  ·         You have installed all software associated with the device?

  ·         Do you have any device life Cam earlier?

  Check to see if the following is useful.

  Method 1: Check list of programs for the device relating to the software. Uninstall the same and try to reinstall the software.

  How to change or remove a program in Windows XP

  Method 2: You can follow the steps in the following article and see if it helps. The error mentioned in the article is different, but this can be tried.

  Troubleshoot installation of Intellipoint and IntelliType LifeCam software

• When I click on the + to open a new window I don't like the images that arise. I tried to change that in all: config; Browser.newtab.URL, but it will not

  When I click on the + to open a new window I don't like the images that arise. I tried several times to change that through words: config; Browser.newtab.URL. I put in the site I want and it won't change. I tried to put in: blank and it don't work. I'm obviously something wrong - can you help please?

  Thank you

  If Firefox is ignorant preference browser.newtab.url, the usual culprit is an extension.

  You can open the page in Firefox Add-ons using either:

  • CTRL + SHIFT + a
  • "3-bar" menu button (or tools) > Add-ons
  • in the Windows "Run" dialog box, type or paste
    firefox.exe "about:addons"

  In the left column, click Extensions. Then, in case of doubt, disable (or delete, if possible) not recognized and unwanted extensions. Do not forget that all extensions are optional, none come with Firefox, and you can learn more about them by checking their reviews on the site of the Add - ons.

  Often, a link will appear above at least an extension disabled to restart Firefox. You can complete your work on the tab and click one of the links in the last step.

  Any improvement?

• Hello, I have a problem with Mozilla Firefox 14 and now also Firefox 15. When I click on .html files on my desktop, firefox will open a new window twice. Where is the th

  Hello, I have a problem with Mozilla Firefox 14 and now also Firefox 15. When I click on .html files on my desktop, firefox will open a new window twice. Where is the problem? Thank you

  That may be a problem with the DDE.

  Try to undo and redo Firefox as default browser.
  
  Make a different browser like IE browser by default and then let Firefox do it again.
  
  See:

  • http://KB.mozillazine.org/Default_browser
  • http://KB.mozillazine.org/Windows_error_opening_Internet_shortcut_or_local_HTML_file_-_Firefox