很多时候，当您想打开或运行Firefox时，您会看到一条消息Firefox 已在运行但没有响应，必须关闭旧的 Firefox 进程才能打开一个新窗口^{(Firefox is already running but is not responding, The old Firefox process must be closed to open a new window)}，如果您看到此消息，这里有几件事您可以做。或者，您可能还会看到一条消息——要打开一个新窗口，您必须先关闭现有的 Firefox 进程，或者重新启动系统。^{(To open a new window, you must first close the existing Firefox process, or restart your system.)}

Firefox已经在运行但没有响应

在这种情况下，发生的事情是您在Firefox中的配置文件无法释放Lock。简而言之，如果一个进程对某些文件进行了锁定，那么其他人就无法使用它。每当应用程序关闭时，它就会退出对其使用的文件的访问。在我们的例子中，Firefox可能已经异常关闭，而将锁留在原地。按照步骤移除锁。

1]使用任务管理器^{(1] Use Task Manager)}

打开任务管理器^{(Task Manager)}并终止所有firefox.exe进程。等待^(Wait)几秒钟，然后看看您现在是否可以运行Firefox浏览器。

2]单击“x”按钮^{(2] Click the ‘x’ button)}

您也可以尝试单击“ Firefox已在运行”对话框的关闭 Firefox 按钮。^{( Close Firefox button)}开发人员包含了一个漂亮的技巧，当您单击关闭按钮时会执行该技巧。它将关闭对话框，结束Firefox进程，并在几秒钟后自动重启Firefox。

3]从Firefox中删除配置文件锁定^{(3] Remove Profile Lock from Firefox)}

如果这没有帮助，您将需要解除对您的个人资料^(Profile)文件的锁定。所有浏览器都维护一个配置文件。当您开始使用它时，配置文件被锁定，只有在您关闭浏览器时才会释放。万一突然关闭，锁定文件仍然存在。

• 在运行提示中，键入 %APPDATA%\Mozilla\Firefox\Profiles
• 这将打开配置文件文件夹。如果您尚未创建配置文件，您应该会在其中看到一个DEFAULT文件夹。（xxxxxx.default）
• 打开配置文件文件夹并删除文件：“parent.lock”

当您尝试删除锁定文件时，您可能会遇到错误。该消息可能类似于“无法删除父级：文件或目录已损坏且无法读取^{(Cannot delete parent: The file or directory is corrupted and unreadable)}”。在这种情况下，请重新启动计算机并尝试删除该文件。

删除文件成功后，重启电脑，尝试打开火狐^(Firefox)。

让我们知道这是否有助于您解决此问题。^{(Let us know if this helped you to fix this issue.)}

Fix: Firefox is already running but is not responding

Many a timе when you want to open or run Fіrеfox, you see а meѕsаge Firefox is already running but is not responding, The old Firefox process must be closed to open a new window, If you see this message, here are a few things you can do. Alternatively, you may also see a message – To open a new window, you must first close the existing Firefox process, or restart your system.

Firefox is already running but is not responding

In this scenario, what has happened is that your profile in Firefox cannot let go of the Lock. In simple words, If a process puts a lock on certain files so nobody else can use it. Whenever an application is closed, it quits access on files it uses. In our case, Firefox may have shut down abnormally, leaving the lock in place. Follow the steps to remove the lock.

1] Use Task Manager

Open Task Manager and terminate all firefox.exe processes. Wait for a few seconds and then see if you can run Firefox browser now.

2] Click the ‘x’ button

You can also try clicking on the Close Firefox button of the “Firefox is already running” dialog box. The developers have included a nifty trick which gets executed when you click on the close button. It will dismiss the dialog, end the Firefox process(es) and, after a few seconds, will automatically restart Firefox.

3] Remove Profile Lock from Firefox

If that doesn’t help, you will need to remove the lock on your Profile files. All the browsers maintain a profile. When you start using it, the profile is locked, and its only released when you close the browser. In case there was an abrupt shutdown, the lock file remained.

• In the Run prompt, type %APPDATA%\Mozilla\Firefox\Profiles
• This will open the profiles folder. If you haven’t created a profile, you should see a single DEFAULT folder in it. (xxxxxx.default)
• Open the profile folder and delete the file: “parent.lock”

It is possible that you may get an error when you attempt to delete the lock file. The message may go like  “Cannot delete parent: The file or directory is corrupted and unreadable“. In this case, restart the computer and try to delete the file.

After deleting the files successfully, restart PC and try to open Firefox.

Let us know if this helped you to fix this issue.

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