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

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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

• 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? 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 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 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 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 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

  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.

• password has expired, but can not use the old password to change, does not recognize the old password

  I have to change the password, but does not recognize my old password which is required to apply the change to a new password to access my account

  Simply log in using the built-in Administrator account (it cannot be deleted) using start > run > "control userpasswords2" to reset the password of the account desired.

• 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

• 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.