Firefox是互联网世界^{(internet world)}中流行的网络浏览器之一。为了浏览器的正常运行，您需要一个未锁定的配置文件。如果它被意外锁定，您将收到一条消息，Firefox 已经在运行，但没有响应^{(Firefox is already running, but is not responding)}。此外，如果Firefox没有正确关闭并在后台运行，您将面临同样的问题。导致问题的原因有很多，请继续阅读。

如何修复 Firefox 已在 Windows 10 中运行^{(How to Fix Firefox is Already Running in Windows 10)}

您在Firefox^(Firefox)中存储的所有数据都收集在Firefox 配置文件^{(Firefox profile)}中。此配置文件存储在本地存储磁盘^{(storage disk)}中。如果Firefox出现任何问题，您可以使用存储在 PC 上的此文件夹。重新安装浏览器时，可以根据需要恢复所有数据。出于一致性和稳定性的原因^{(consistency and stability reasons)}，有时您的浏览器会锁定您的个人资料，这表明您的浏览器已被锁定。在这种情况下，应用程序使用此配置文件^{(profile file)}运行浏览器，从而触发问题。以下是导致Firefox已在运行但未响应问题的一些原因：

• 几个Firefox任务在后台运行，但不可见。
• 当Firefox在浏览过程中崩溃时，您将面临同样的问题。
• Firefox已更新，但更改并未反映在浏览器中。
• 有时，Firefox由于存在应用程序错误而冻结，因此所有浏览器任务都留在后台。
• ^{(Corrupt cache and extensions)}浏览器中的缓存和扩展损坏。
• 用户配置文件^{(user profile)}中的任何故障和不兼容的浏览器设置。

在本节中，我们编制了一份可帮助您解决问题的方法列表。这些方法是根据其严重程度和有效性^{(severity and effectiveness)}安排的。以相同的顺序跟随它们以获得完美的结果。

方法一：重启电脑^{(Method 1: Restart PC)}

任何与 PC 相关的问题的首要故障排除方法^{(troubleshooting method)}是重新启动计算机。重新启动计算机将修复与其相关的所有临时故障，帮助您修复所有浏览器冲突。按照下面提到的说明重新启动 PC，或者关闭计算机并重新启动。

1. 同时按 Windows + D keys导航到 桌面 ^(Desktop ) 。

2. 现在，同时按 Alt + F4 keys 。您将看到一个弹出窗口，如下所示。

3. 现在，单击下拉框并选择 重新启动 ^(Restart )选项。

4. 最后， 按 Enter ^(Enter )重新启动系统。

方法二：重启火狐^{(Method 2: Restart Firefox)}

您可以按照以下步骤手动终止所有Firefox进程。^(Firefox)

1. 同时按Ctrl + Shift + Esc keys启动任务管理器^{(Task Manager)}。

2. 在进程^(Processes)选项卡中，选择Firefox进程。

3. 最后，点击结束任务^{(End task)}并重启^(reboot) 电脑^(the PC)。

4. 现在，再次启动Mozilla Firefox浏览器。

另请阅读：^{(Also Read:)} 如何修复 Firefox 黑屏问题^{(Fix Firefox Black Screen Issue)}

方法 3：在故障排除模式下打开 Firefox^{(Method 3: Open Firefox in Troubleshoot Mode)}

在故障排除模式下重新启动Firefox将禁用所有扩展，关闭硬件加速^{(hardware acceleration)}，并使用默认的工具栏^{(use default toolbar)}设置和主题。这将帮助您修复Firefox已经在运行但没有响应的问题以及Firefox右键单击​​不工作的问题。以及Firefox右键单击​​不起作用的问题。因此，要在故障排除模式下重新启动Firefox，请按照以下步骤操作：

1. 启动Firefox并点击应用程序菜单^{(Application Menu )}

2. 选择帮助^{(Help )}选项

3.点击故障排除模式^{(Troubleshoot Mode)}

注意：^{(Note: )}您也可以在打开Firefox时按^(Firefox)Shift 键^{(Shift key)}以在故障排除模式下启动它。

4.点击重启^{(Restart )}确认提示

5.再次^(Again)，点击打开确认提示^(Open)

注意：^{(Note: )}要关闭故障排除模式，请按照步骤 1 和 2 并单击关闭故障排除模式^{(Turn Troubleshoot Mode off )}

方法 4：关闭硬件加速（如果适用）^{(Method 4: Turn Off Hardware Acceleration (If Applicable))}

如果您的浏览器在图形处理器和驱动程序设置方面存在问题，您可能会遇到问题。您可以尝试按照以下步骤将其关闭：

1. 启动Firefox并点击菜单^{(Menu )}图标

2. 点击下拉菜单中的设置^{(Settings )}

3. 单击左侧窗格中的^{(left pane)}常规^{(General )}选项卡，然后向下滚动到性能^{(Performance )}菜单

4. 取消选中这些选项：

• 使用推荐的性能设置^{(Use recommended performance settings)}
• 可用时使用硬件加速^{(Use hardware acceleration when available )}

5.同时按住Ctrl + Shift + Q keys 退出浏览器

6. 最后，重新启动浏览器^{(Relaunch the browser)}。

另请阅读：^{(Also Read:)} 如何修复 Firefox^{(Fix Firefox)}不播放视频^(Videos)

方法 5：调整扩展^{(Method 5: Tweak Extensions)}

如果您在浏览器中启用了任何有问题的扩展程序，您可能会遇到Firefox已经在运行，但没有响应的错误。要解决它们，请更新扩展（以修复错误）或从浏览器中禁用它们。以下是一些更新和禁用Firefox扩展的说明。

选项 I：更新 Firefox 扩展^{(Option I: Update Firefox Extensions)}

如果您在浏览器中启用了任何有问题的扩展，您可以尝试更新它们以解决Keyboard not working in Firefox。

1. 单击 Firefox 中的菜单^{(Menu )}图标，然后单击附加组件和主题^{(Add-ons and themes)}

2.点击设置^(Settings)

3.点击扩展和主题^{(Extensions & Themes)}

4. 单击设置^(Settings)并选择检查更新^{(Check for Updates )}选项

5A。按照屏幕上的说明^{(on-screen instructions)}更新您的扩展程序。

5B。如果不需要更新，则 - 未找到更新。重新启动^{(No updates found. Restart)} Firefox以检查您是否已解决问题

选项二：禁用 Firefox 扩展^{(Option II: Disable Firefox Extensions)}

如果您没有通过更新Firefox扩展获得任何修复，您可以按照下面提到的步骤禁用它们。

1. 启动Firefox并点击菜单^{(Menu )}图标

2.选择附加组件和主题^{(Add-ons and themes )}

3.单击左侧窗格中的扩展并^{(Extensions )}关闭^{(toggle off)}扩展

4.同样，一一禁用所有扩展并检查导致问题的扩展

5. 最后，如果您确定是哪个扩展程序给您带来了麻烦，请单击与其对应的三点图标并选择^{(three-dotted icon )}删除^{(Remove )}选项

方法六：清除浏览器缓存^{(Method 6: Clear Browser Cache)}

损坏的浏览器缓存^{(browser cache)}等临时文件可能会导致最终用户连接中断。当您上网时，这可能会导致讨论的问题。尝试清除浏览器缓存^{(browser cache)}并检查是否已修复错误。以下是删除Firefox 浏览器^{(Firefox browser)}缓存的一些说明。

1. 启动火狐^(Firefox)浏览器。

2. 点击屏幕右上角的^{(right corner)}菜单^{(Menu )}图标

3.从下拉列表中选择设置选项^{(Settings )}

4.单击 左侧窗格中的隐私和安全选项^{(Privacy & Security )}

5. 单击清除数据^{(Clear Data)}按钮以获取Cookie 和站点数据^{( Cookies and Site Data)}

6. 取消选中Cookies 和站点数据^{(Cookies and Site Data )}框并选中缓存的 Web 内容^{(Cached Web Content)}框。

7. 最后，点击清除^{(Clear )}按钮清除Firefox缓存的 cookie。

另请阅读：^{(Also Read:)} 修复^{(Fix Server)}Firefox中未找到服务器的错误^{(Found Error)}

方法 7：启用 Firefox 配置文件文件夹的访问权限^{(Method 7: Enable Access Rights for Firefox Profiles Folder)}

如果您尝试访问只有只读权限的文件的任何内容，那么您可能会遇到所讨论的问题。按照以下步骤，确保您已授予对配置文件文件夹的适当访问权限。^{(profile folder)}

1. 单击Windows + E keys 打开文件资源管理器^{(File Explorer)}

2.复制并粘贴地址栏中的以下路径^(path)

C:\Users\USERNAME\AppData\Roaming\Mozilla\Firefox

3. 右键单击​​ Profiles文件夹并选择Properties

4. 在常规^{(General )}选项卡中，取消选中复选框只读（仅适用于文件夹中的文件）^{(Read-only (Only applies to files in folder) )}

5.最后，点击应用^{(Apply )}，然后点击确定^{( OK )}保存更改

方法 8：删除 Firefox 配置文件锁定文件^{(Method 8: Delete Firefox Profile Lock File)}

如果Firefox异常崩溃，锁定文件^{(lock file)}会留在文件资源管理器^{(File Explorer)}中。此文件可能会干扰导致上述问题的浏览器的正常功能。建议您按照以下说明删除此配置文件锁定文件^{(profile lock file)}，以解决Firefox已运行问题。

1. 同时按住Windows + E keys 打开文件资源管理器^{(File Explorer)}

2.在导航菜单中粘贴以下路径^(path)并按回车键^{(Enter key)}

%APPDATA%\Mozilla\Firefox\Profiles\

3.打开以.default^(.default)结尾的文件夹

4.向下滚动^(Scroll)并右键单击parent.lock文件并删除

注意：^{(Note: )}如果您使用-no-remote命令行选项启动 Firefox，请删除它。

另请阅读：^{(Also Read:)} 修复^(Fix)Firefox上的连接不安全错误^{(Secure Error)}

方法9：更新火狐^{(Method 9: Update Firefox)}

Firefox经常发布更新以修复其中的错误。您可以按照以下说明更新Firefox以解决Firefox已在运行的问题。

1.打开火狐^{(Firefox )}，点击菜单^{(Menu )}如图

2.选择帮助^{(Help )}选项

3. 点击关于 Firefox^{(About Firefox)}。

4A。屏幕上会弹出一个新窗口。^(Window)在这里检查您的Firefox 是否是最新的^{(Firefox is up-to-date)}。

4B。否则，请按照屏幕上的说明^{(on-screen instructions)}更新 Firefox

方法 10：更新 Windows^{(Method 10: Update Windows )}

微软^(Microsoft)正试图改进其所有版本的Windows，以使 PC 没有任何错误。您可以通过更新来修复Windows^(Windows) 10 计算机中的错误和与浏览器相关的问题。按照下面提到的步骤更新Windows并修复Firefox已经运行的问题。

1. 同时按 Windows + I keys 启动 设置^(Settings)。

2. 单击 更新和安全^{(Update & Security)} 磁贴，如图所示。

3. 在 Windows 更新 ^{(Windows Update )}选项卡中，单击 检查更新^{(Check for updates)} 按钮。

4A。如果有新更新可用，请单击 立即安装^{(Install Now)} 并按照说明进行更新。

4B。否则，如果Windows是最新的，那么它将显示 您是最新的^{(You’re up to date)} 消息。

另请阅读：^{(Also Read:)} 如何在Chrome中启用^(Chrome)隐身模式^{(Incognito Mode)}

方法 11：创建新的 Firefox 配置文件^{(Method 11: Create New Firefox Profile)}

创建新的Firefox 配置文件^{(Firefox profile)}将解决与用户配置文件^{(user profile)}相关的常见问题。以下是一些创建新配置文件以修复Firefox已运行问题的简单说明。

1. 同时按下Windows + R keys 打开运行^{(Run )}对话框

2.输入firefox.exe -P并按Enter 键^{(Enter key)}。

3. 单击创建配置文件...^{(Create Profile… )}按钮。

4. 单击创建配置文件向导^{(Create Profile Wizard)}中的下一步^{(Next )}。

5. 在输入新的配置文件名称^{(Enter new profile name )}字段中输入新的配置文件名称

6.最后，点击完成^{(Finish )}完成该过程

7. 现在，您将再次导航到配置文件管理器^{(Profile Manager )}。使用此处列出的新配置文件再次启动 Firefox 。^{(Start Firefox)}你不应该面对^{(t face)} Firefox已经在运行但没有响应的问题

方法 12：刷新 Firefox^{(Method 12: Refresh Firefox)}

通过刷新浏览器，Firefox将保存；

• 书签
• 浏览和下载历史
• 密码、Cookie
• 网络表单自动填充信息
• 个人词典 

但它会删除以下数据。

• 扩展和主题
• 网站权限
• 修改首选项
• 添加了搜索引擎
• DOM 存储
• 安全证书和设备设置^{(security certificate and device settings)}
• 下载操作
• 用户^(User)样式和工具栏^(Toolbar)自定义。

注意：^{(Note: )}刷新浏览器后，您的旧Firefox 配置文件^{(Firefox profile)}将放置在您的桌面上，并带有一个名为Old Firefox Data的文件夹。您可以从此文件夹中将 Firefox 数据恢复到新的配置文件中。^{(Firefox data)}如果您不需要此文件夹，您可以随时将其删除。

1. 打开Firefox并点击菜单^{(Menu )}图标

2.点击帮助^{(Help )}选项

3. 选择更多故障排除信息^{(More troubleshooting information )}选项

4.点击刷新火狐^{(Refresh Firefox)}

5. 再次点击刷新 Firefox^{(Refresh Firefox )}选项

6.在导入向导^{(Import Wizard)}窗口中单击完成^{(Finish )}

7. 最后，点击Let’s go! 继续浏览您的浏览的选项

另请阅读：^{(Also Read:)}如何修复 Chrome^{(Fix Chrome Ran Out)}内存不足

方法 13：重新安装 Firefox^{(Method 13: Reinstall Firefox)}

如果您在Firefox中有损坏的安装文件，您可以通过重新安装^(Firefox)Firefox 浏览器^{(Firefox browser)}轻松解决此问题。按照以下步骤重新安装Firefox 浏览器并修复 Firefox^{(Firefox browser and fix Firefox)}已运行问题。

1. 单击开始^(Start)，键入控制面板^{(Control Panel)}，然后按Enter 键^{(Enter key)}。

2. 设置View by > Large icons，然后单击程序和功能^{(Programs and Features )}

3. 点击Firefox并选择卸载^{(Uninstall )}选项

4. 确认提示（如果有），并等待浏览器在您的设备上卸载。然后，重新启动你的电脑^{(reboot your PC)}

5.从官网下载^{(official website)}Mozilla Firefox浏览器。

6.双击setup.exe 文件运行^{(setup.exe file)}Firefox 安装程序^{(Firefox Installer )}。

推荐的：^{(Recommended:)}

• 修复 Teamviewer^{(Fix Teamviewer)}在Windows 10中无法^{(Windows 10)}连接^(Connecting)的问题
• 修复 Windows 错误 0 ERROR_SUCCESS
• 修复谷歌浏览器状态断点错误^{(Fix Google Chrome STATUS BREAKPOINT Error)}
• 如何修复 Firefox^{(Fix Firefox)}不加载^(Loading)页面

我们希望本指南对您有所帮助，并且您能够修复Firefox 已在运行但^{(Firefox is already running but is not responding)}在Windows 10上没有响应的问题。让我们知道哪种方法最适合您。此外，如果您对本文有任何疑问/建议，请随时将它们放在评论部分。

Fix Firefox is Already Running

Firefox is one of the popular wеb brоwsers in thе internet world. For the proper funсtіoning of the browser, you need an unlocked profile. If it gets locked accidentally you will reсeive a message, Firefox is already running, but is not responding. Also, if Firefox is not shut down properly and is running in the background, you will face the same problem. There are a lot of reasons that cause the issue so, continue reading.

How to Fix Firefox is Already Running in Windows 10

All the data you store in Firefox are collected in the Firefox profile. This profile is stored in a local storage disk. If anything is wrong with Firefox, you can use this folder stored on your PC. When you reinstall the browser, all the data can be restored if needed. For consistency and stability reasons, sometimes your browser locks your profile which indicates that your browser is locked. In this case, the application uses this profile file to run the browser, thereby triggering the issue. Here are some reasons that causes Firefox is already running, but is not responding issue:

• Several Firefox tasks are running in the background, but not visible.
• When Firefox crashes in the middle of browsing, you will face the same issue.
• Firefox is updated, yet changes are not reflected in the browser.
• Sometimes, Firefox freezes due to the presence of application bugs thus all the browser tasks are left in the background.
• Corrupt cache and extensions in the browser.
• Any glitches in the user profile and incompatible browser settings.

In this section, we have compiled a list of methods that will help you fix the problem. The methods are arranged according to the severity and effectiveness of the same. Follow them in the same order to attain perfect results.

Method 1: Restart PC

The first and foremost troubleshooting method for any PC-related problem is restarting the computer. Rebooting the computer will fix all the temporary glitches associated with it helping you to fix all browser conflicts. Follow the below-mentioned instructions to reboot the PC or alternatively shut down the computer and start it over again.

1. Navigate to the Desktop by pressing Windows + D keys simultaneously.

2. Now, press Alt + F4 keys simultaneously. You will see a pop-up window as shown below.

3. Now, click on the drop-down box and select the Restart option.

4. Finally, hit Enter to reboot your system.

Method 2: Restart Firefox

You can manually terminate all the Firefox processes by following the below-mentioned steps.

1. Launch Task Manager by hitting Ctrl + Shift + Esc keys simultaneously.

2. In the Processes tab, select Firefox process.

3. Finally, click on End task and reboot the PC.

4. Now, again launch the Mozilla Firefox browser.

Also Read: How To Fix Firefox Black Screen Issue

Method 3: Open Firefox in Troubleshoot Mode

Restarting Firefox in troubleshooting mode will disable all the extensions, turn off hardware acceleration, and use default toolbar settings, themes, instead. This will help you fix Firefox is already running, but is not responding issue as well as Firefox right click not working issue. as well as Firefox right click not working issue.. So, to restart Firefox in troubleshooting mode, follow the below-mentioned steps:

1. Launch Firefox and click on the Application Menu

2. Select the Help option

3. Click on Troubleshoot Mode

Note: You can also press the Shift key while opening Firefox to launch it in Troubleshooting mode.

4. Confirm the prompt by clicking on Restart

5. Again, confirm the prompt by clicking on Open

Note: To turn off troubleshooting mode, follow steps 1 & 2 and click on Turn Troubleshoot Mode off

Method 4: Turn Off Hardware Acceleration (If Applicable)

You may face the issue if your browser has some issues with graphical processors and driver setups. You can try turning it off by following the below-mentioned steps:

1. Launch Firefox and click on the Menu icon

2. Click on Settings from the drop-down menu

3. Click on General tab in the left pane, and scroll down to the Performance menu

4. Uncheck these options:

• Use recommended performance settings
• Use hardware acceleration when available

5. Press and hold Ctrl + Shift + Q keys together to quit the browser

6. Finally, Relaunch the browser.

Also Read: How to Fix Firefox Not Playing Videos

Method 5: Tweak Extensions

If you have any problematic extensions enabled in your browser, you may face Firefox is already running, but is not responding error. To resolve them, either update the extensions (to fix bugs) or disable them from your browser. Here are a few instructions to update and disable Firefox extensions.

Option I: Update Firefox Extensions

If you have any problematic extensions enabled in your browser, you could try updating them to resolve Keyboard not working in Firefox.

1. Click on the Menu icon in Firefox, followed by Add-ons and themes

2. Click on Settings

3. Click on Extensions & Themes

4. Click on the Settings and select the Check for Updates option

5A. Follow the on-screen instructions to update your extension.

5B. If nothing needs to be updated then-No updates found. Restart Firefox to check if you have fixed the issue

Option II: Disable Firefox Extensions

If you did not attain any fix by updating your Firefox extensions, you can disable them by following the below-mentioned steps.

1. Launch Firefox and click on the Menu icon

2. Select Add-ons and themes

3. Click on Extensions in the left pane and toggle off the extensions

4. Likewise, disable all the extensions one by one and check which extension is causing the issue

5. Finally, if you have identified which extension is causing you the trouble, click on the three-dotted icon corresponding to it and select the Remove option

Method 6: Clear Browser Cache

Temporary files like corrupt browser cache might cause interruptions in the end-user connection. This may lead to the discussed issue when you surf the internet. Try clearing the browser cache and check if you have fixed the error. Here are a few instructions to remove the Firefox browser cache.

1. Launch Firefox web browser.

2. Click on the Menu icon at the top right corner of the screen

3. Select the Settings option from the drop-down list

4. Click on Privacy & Security option in the left pane

5. Click on Clear Data button for Cookies and Site Data

6. Uncheck the Cookies and Site Data box and check Cached Web Content box.

7. Finally, click on the Clear button to clear the Firefox cached cookies.

Also Read: Fix Server Not Found Error in Firefox

Method 7: Enable Access Rights for Firefox Profiles Folder

If you try to access any contents of the file that has only read-only rights, then you may face the discussed problem. Ensure you have granted proper access rights to the profile folder by following the below-mentioned steps.

1. Click on the Windows + E keys to open File Explorer

2. Copy and paste the below path in the address bar

C:\Users\USERNAME\AppData\Roaming\Mozilla\Firefox

3. Right-click on the Profiles folder and select Properties

4. In the General tab, uncheck the box Read-only (Only applies to files in folder)

5. Finally, click on Apply and then OK to save the changes

Method 8: Delete Firefox Profile Lock File

If Firefox crashes abnormally, the lock file is leftover in your File Explorer. This file may interfere with the normal functions of the browser leading to the said issue. You are advised to delete this profile lock file as instructed below to solve Firefox is already running problem.

1. Press and hold Windows + E keys together to open the File Explorer

2. Paste the following path in the navigation menu and press Enter key

%APPDATA%\Mozilla\Firefox\Profiles\

3. Open folder ending with .default

4. Scroll down and right-click on the parent.lock file and delete

Note: If you are starting Firefox with -no-remote command-line options, then remove this.

Also Read: Fix Your Connection is not Secure Error on Firefox

Method 9: Update Firefox

Firefox often releases updates to fix bugs in it. You can update Firefox to solve Firefox is already running problem as instructed below.

1. Open Firefox and click on the Menu as shown

2. Select Help option

3. Click on About Firefox.

4A. A new Window pops up on the screen. Here check if your Firefox is up-to-date.

4B. Else, follow the on-screen instructions to update Firefox

Method 10: Update Windows

Microsoft is trying to improve all of its versions of Windows to bring a PC without any errors. You can fix the bugs and browser-related problems in your Windows 10 computer by updating it. Follow the below-mentioned steps to update Windows and fix Firefox is already running issue.

1. Press Windows + I keys simultaneously to launch Settings.

2. Click on the Update & Security tile, as shown.

3. In the Windows Update tab, click on Check for updates button.

4A. If a new update is available, then click Install Now and follow the instructions to update.

4B. Otherwise, if the Windows is up-to-date, then it will show You’re up to date message.

Also Read: How to Enable Incognito Mode in Chrome

Method 11: Create New Firefox Profile

Creating a new Firefox profile will resolve common problems associated with the user profile. Here are a few simple instructions to create a new profile to fix Firefox is already running issue.

1. Press the Windows + R keys together to open the Run dialog box

2. Type firefox.exe –P and hit Enter key.

3. Click on Create Profile… button.

4. Click on Next in Create Profile Wizard.

5. Type a new profile name in the Enter new profile name field

6. Finally, click on Finish to complete the process

7. Now, you will be navigated to the Profile Manager again. Start Firefox again with a new profile listed there. You shouldn’t face Firefox is already running but is not responding issue

Method 12: Refresh Firefox

By refreshing your browser, Firefox will save;

• Bookmarks
• Browsing and download history
• Passwords, Cookies
• Webform auto-fill information
• Personal dictionary 

But it deletes the following data.

• Extensions and themes
• Website permissions
• Modified preferences
• Added search engines
• DOM storage
• security certificate and device settings
• Download actions
• User styles and Toolbar customizations.

Note: Upon refreshing your browser, your old Firefox profile will be placed on your desktop with a folder named Old Firefox Data. You can restore your Firefox data to your new profile from this folder. If you do not need this folder, you can delete it anytime.

1. Open Firefox and click on the Menu icon

2. Click on Help option

3. Select the More troubleshooting information option

4. Click on Refresh Firefox

5. Again, click on the Refresh Firefox option

6. Click on Finish in the Import Wizard window

7. Finally, click on Let’s go! Option to continue surfing your browsing

Also Read: How to Fix Chrome Ran Out of Memory

Method 13: Reinstall Firefox

If you have corrupt installation files in Firefox, you can easily fix this issue by reinstalling the Firefox browser. Follow the below-mentioned steps to reinstall the Firefox browser and fix Firefox is already running issue.

1. Click on Start, type Control Panel, and hit the Enter key.

2. Set View by > Large icons and click on Programs and Features

3. Click on Firefox and select the Uninstall option

4. Confirm the prompt if any, and wait until the browser gets uninstalled on your device. Then, reboot your PC

5. Download the Mozilla Firefox browser from the official website.

6. Run the Firefox Installer by double-clicking on setup.exe file.

Recommended:

• Fix Teamviewer Not Connecting in Windows 10
• Fix Windows Error 0 ERROR_SUCCESS
• Fix Google Chrome STATUS BREAKPOINT Error
• How to Fix Firefox Not Loading Pages

We hope that this guide was helpful and you were able to fix Firefox is already running but is not responding on Windows 10. Let us know which method worked for you the best. Also, if you have any queries/suggestions regarding this article, then feel free to drop them in the comments section.

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