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

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All of your personal settings, bookmarks, and other information are kept in your Firefox profile. Firefox needs an unlocked profile to start up, and if the profile is locked, it displays the message, Firefox is already running, but is not respondingA copy of Firefox is already open. This article explains what to do if you see this message and how to prevent it from showing at startup.

Note: If this is a recurring problem, see Firefox hangs when you quit it for possible causes and solutions.

FirefoxAlreadyOpen-Mac

Fx34already-running-Win7 Firefox Already Running - Win1 Firefox Already Running - Win1

End Firefox processes

If Firefox did not shut down normally when you last used it, Firefox might still be running in the background, even though it is not visible. If you try to open it while it's running, an error message will appear with the option to click Close Firefox. If that doesn't solve the problem, restart your computer or try the following options. Restart your computer to see if the problem goes away or try the following options.

Ubuntu Linux

  1. Click on System and choose Administration.
  2. In Administration, click on System Monitor. Here you will find firefox-bin one or more times.
  3. Highlight the listing and click End Process for each one.

Use the Windows Task Manager to close the existing Firefox process

  1. Right-click on an empty spot in the Windows task bar and select Task Manager (or press Ctrl+Shift+Esc).
  2. When the Windows Task Manager opens, select the Processes tab.
    Task Manager
  3. Select the entry for firefox.exe (press F on the keyboard to find it) and click End Process.
  4. Click Yes in the "Task Manager Warning" dialog that appears.
  5. Repeat the above steps to end any additional firefox.exe processes, then exit the Windows Task Manager.
  6. Start Firefox normally.

Remove the profile lock file

Firefox may have shut down abnormally, leaving the lock file in place. To fix this, open the profile folder (see Finding your profile without opening Firefox) and delete the parent.lock file lock and .parentlock files.parentlock file.

Initialize the connection to a file share

If you store the profile on a file share, try accessing the file share beforehand using Windows Explorer.

Check access rights

Firefox must also have the right to create files in the profile folder. The error can occur if you try to use a profile from a file system mounted with read-only permission (e.g. a remote Windows share which doesn't have "Allow network users to change my files" checked).

To check if the profile folder has the proper permissions:

  1. Find your Firefox profile folder - see Finding your profile without opening Firefox.
    • If you only have one profile, its folder would have "default" in the name.
  2. Right-click on your profile folder and select Properties.
  3. Click on the General tab.
    readonlyprofile.png
  4. Make sure Read-only is not checked marked.
  1. Find your Firefox profile folder - see Finding your profile without opening Firefox.
    • If you only have one profile, its folder would have "default" in the name
  2. Hold down the Ctrl key while you click on your profile folder, and select Get Info.
  3. Make sure Ownership & Permissions is set to Read & Write.
  1. Find your Firefox profile folder - see Finding your profile without opening Firefox
    • If you only have one profile, its folder would have "default" in the name.
  2. Right-click on your profile folder and select Properties.
  3. Click on the Permissions tab.
  4. Make sure Folder access is set to Create and delete files.

Restore data from a locked profile

If you are unable to unlock the profile using the above methods, use the Profile Manager to create a new profile and migrate your data from the locked profile to the new profile. For information on how to do this, see Recovering important data from an old profile.




Based on information from Profile in use (mozillaZine KB)

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