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

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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. 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 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.

• 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

• 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 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

• 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

• 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 need to complete the process to open firefox again and it's a pain in the asss.

  I posted this before I discovered that the last update solved the problem.

  but he was hitting me on the previous version, I can't reember but I think it was more than 30.

• 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 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.

• When I'm looking online, I get the error message saying: my graphics card is not responding and the laptop stops or gets himself.

  Hello

  I have a fujitsu lifebook p series windows 7 and every now and then especially when I am looking online I get the error message saying: my graphics card is not responding and the laptop stops or gets himself.  I challenged tech stores to be looked at, but they were not able to fix it. Does anyone have any suggestions? Thank you
   
  Original title: help again...

  I have moved your question to area drivers & hardware.

  If your PC uses the Intel chipset, see this: http://communities.intel.com/message/172740#172740

  Updated drivers can be made of:

  https://Downloadcenter.Intel.com/default.aspx

  Best bet may be to contact the vendor of PC.

  -steve

• The Task Manager does not close firefox already running but does not

  Firefox stops running at random times. I'm used to be able to shut up by the Manager of tasks without problem. Now when I try nothing happens. Process highlights and just it running no matter how many times I clicked. I can close other processes very well. Firefox crashes a lot more often lately, and it's a pain to have constantly close and restart to clean. Firefox crashes so that in different websites, or even after I closed it but have not stopped since. When I try to open it I get the message ' existing enforcement does not. But even when I close it normally always seems to remain in the background. I am not tech savvy at all any solution would be appreciated. Thank you.

  You will need to get to the bottom of this problem and try to prevent that from happening in the future

  1. First create and use a new additional Firefox profile. I'm hoping that will result in at least a Firefox that you can close.
     Use the Profile Manager to create and delete profiles Firefox_creation-a-profile
  2. Note that normally, the method of closing of Firefox is to use the menus in Firefox | Firefox button. (Using other methods might create problems and there are some bugs of current / recent _{Bug 845681 & 8537799} )
     • By default on XP file-> exit , (other systems use the Firefox button options)
  3. What you are experiencing seems to be blocking Firefox, although they may often be terminated by killing the Firefox process.
     Firefox crashes or does not - how to fix
  4. Sometimes after several Firefox problems will have several copies for restore files, and you may lose some information. tabs removing these non-functional copies may be required to resolve the issue
     • See http://kb.mozillazine.org/Firefox_hangs#Multiple_sessionstore.js_files
       and http://kb.mozillazine.org/Sessionstore.js
       Best additional note numbered perhaps exist.

• Firefox does not open external links (from other programs), it says its already running but does not.

  I'm having this problem, everytime i click a link on other program, like the program's link on the about tab, or a youtube link on Live Messenger, it won't open, a dialog pops up saying firefox is already running and not responding, but it is there, and working.
  If it matters, i have the "beta" tab preview enabled on the windows 7 toolbar.
  

  Make sure that you do not start Firefox with the - No.-line of remote control switch.
  You can verify that the target line in the properties of the shortcut of Firefox (office).

  See also http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile