如果您正在寻找可靠的浏览体验^{(browsing experience)}，Firefox将是您的最佳选择。该浏览器丰富的主题和扩展支持^{(theme and extension support)}吸引了世界各地的众多观众。然而，这并不意味着它也没有问题。有时您可能会遇到Firefox 没有响应的^{(Firefox is not responding)}问题。如果你也面临同样的问题，别担心！你不是一个人。您可以按照本文中讨论的方法，通过简单有效的故障排除方法自行解决此问题。因此，请继续阅读以修复Firefox在启动问题上没有响应的问题。

如何修复 Firefox 没有响应^{(How to Fix Firefox is Not Responding)}

以下是导致此问题的一些原因。在很多情况下，您可能会遇到Firefox在启动时没有响应的问题。尽管如此^{(Nevertheless)}，下面列出了一些常见和重复的原因。分析^(Analyze)导致问题的原因并相应地遵循故障排除方法。

• 糟糕^(Bad)的互联网连接。
• Windows 10 PC 上未授予Firefox的一些强制性权利^{(few mandatory rights)}（创建/访问文件的权利） 。
• Firefox 配置文件文件夹已锁定^(locked)在您的计算机中。
• 损坏^(Corrupt)的 Firefox 或系统文件。
• 如果有太多的免费软件转换器^{(too many freeware converters)}（如 word 到PDF、JPEG到PNG等）同时在后台运行。
• Firefox 中的数据库文件^{(database files)}配置错误。
• 不兼容的附加组件和主题^{(add-ons and themes)}。
• 存在恶意软件和病毒^{(malware & viruses)}。
• 防病毒软件^(Antivirus)正在阻止 Firefox 。
• Firefox 会干扰其他浏览器设置^{(other browser settings)}。
• ^{(Too many tabs)}同时打开的选项卡太多。

无论如何，您可以按照下面讨论的方法轻松解决此问题。

在本节中，您将了解几种有效的故障排除方法，这些方法将帮助您解决所讨论的问题。按照相同的顺序进行操作，由于它们是从基本故障排除方法到高级故障排除方法，因此即使在前两到三种方法中，您也可以获得完美的结果。

基本故障排除提示^{(Basic Troubleshooting Tips)}

在尝试任何高级故障排除方法之前，请尝试这些基本故障排除方法。即使是基本的方法也能快速、更轻松地解决问题。

• 检查您的系统是否连接到正确的 Internet 连接^{(proper Internet connection)}。
• ^{(Close unnecessary tabs and Firefox windows)}如果选项卡太多，请关闭不必要的选项卡和 Firefox 窗口。
• ^{(Restart Firefox browser)}通过关闭所有浏览器窗口重新启动 Firefox 浏览器。除此之外，您还可以在任务管理器中结束所有^{(Task Manager)}Firefox进程。
• 尝试在疑难解答模式下^{( in Troubleshoot Mode)}打开 Firefox 。为此，请在启动浏览器时按住Shift 键。^{(Shift key)}

方法 1：切换到默认主题（如果适用）^{(Method 1: Switch to Default Theme (If applicable))}

Firefox中有很多自定义主题，例如Dark theme, Firefox Alpenglow, Light, Rawrrr!, That’s So Fire, 等等。他们可能看起来很有创意和吸引力。但是它们可能会导致浏览器不稳定，从而导致此问题。如果您有任何其他浏览器主题而不是默认系统主题^{(default system theme)}，请按照下面提到的步骤切换到默认主题^{(Default theme)}，如下所示，以修复Firefox无响应问题。

1. 按Windows 键^{(Windows key)}。输入Firefox并打开它。

2. 点击 菜单 ^(Menu )图标，如图所示。

3. 然后，如图所示选择 附加组件和主题^{(Add-ons and themes )}选项。

注意：^{(Note: )}您也可以同时按Ctrl +Shift + A keys 打开加载项和主题^{(Add-ons and themes )}页面。

4. 然后，选择左侧窗格中的^{(left pane)}主题 ^(Themes )选项，然后单击 系统主题旁边的启用按钮^{(Enable )}- 自动^{(System theme – auto )}主题，如图所示。

5. 重新启动Firefox并检查Firefox启动时无响应问题^{(startup problem)}是否已解决。

方法 2：启用适当的访问权限^{(Method 2: Enable Proper Access Rights)}

如果您计算机中的Firefox 配置^{(Firefox profile)}文件夹没有授予访问、写入、复制或传输文件^{(copy or transfer files)}的适当权限，您将面临Firefox无响应问题。首先^(First)，检查Firefox 配置^{(Firefox profile)}文件的文件和文件夹是否具有适当的访问权限。如果不是，请按照以下说明进行纠正。

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

2. 现在，在地址栏中粘贴以下路径^(path)。

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

3. 现在，右键单击Profiles文件夹并选择Properties选项，如图所示。

4. 在配置文件属性^{(Profiles Properties )}窗口中，取消选中常规选项卡中的^{(General tab)}只读（仅适用于文件夹中的文件）^{(Read-only (Only applies to files in folder) )}框，如下所示。

5. 最后，单击Apply > OK 保存更改并重新启动您的 PC^{(restart your PC)}。

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 3：删除 Profile 文件夹中的 Parent.Lock 文件^{(Method 3: Delete Parent.Lock File in Profile Folder)}

当您的Firefox 浏览器^{(Firefox browser)}崩溃或关闭时，会在Profile 文件夹^{(Profile folder)}中自动创建Firefox 锁定^{(Firefox lock)}文件。该文件不会让您正确操作Firefox 浏览器^{(Firefox browser)}，导致Firefox在启动问题时无响应。要解决此问题，请按照以下说明删除Firefox Profile 文件夹中的^{(Firefox Profile folder)}Parent.Lock文件。

注意：^(Note:)在执行以下步骤之前，请关闭所有Firefox窗口。^(Firefox)

1. 如上述方法所述，打开文件资源管理器^{(File Explorer)}并导航到以下路径^(path)。

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

2. 然后，在搜索配置文件^{(Search Profiles )}字段中键入Parent.Lock文件，如图所示。^{(Parent.Lock )}

3. 然后，选择所有Parent.Lock文件并单击删除^{(Delete )}按钮，如图所示。

4. 现在，关闭浏览器并重新启动^(reboot) 您的 PC^{(your PC)}并检查Firefox启动时无响应问题是否仍然存在。

方法 4：运行恶意软件扫描^{(Method 4: Run Malware Scan)}

恶意软件和病毒攻击^{(Malware and virus attacks)}可能是Firefox没有响应的最可能原因。病毒可能会干扰和更改Firefox 文件夹^{(Firefox folder)}中的一些关键文件，从而引发多个问题。通过Windows Defender 程序^{(Windows Defender program)}执行以下说明的步骤来扫描您的系统。

1. 同时按住Windows + I keys 打开设置^(Settings)。

2. 在这里，点击更新和安全^{(Update & Security)}，如图所示。

3. 然后，在左窗格中选择Windows 安全选项。^{(Windows Security )}

4. 接下来，选择保护区域下的^{(Protection areas)}病毒和威胁保护^{(Virus & threat protection )}选项。

5. 点击扫描选项^{(Scan Options)}，如图所示。

6. 根据您的喜好选择扫描选项，然后单击^{(preference and click)}立即扫描。^{(Scan Now.)}

7A。如果有任何威胁，请单击当前威胁^{(Current threats)}下的开始操作^{(Start Actions )}。

7B。如果您的系统中没有任何威胁，系统将显示“无需操作^{(No actions needed )}”警报，如下所示。

另请阅读：^{(Also Read:)}如何修复 Firefox^{(Fix Firefox)}不加载^(Loading)页面

方法5：修复系统文件^{(Method 5: Repair System Files)}

您可以通过运行系统文件检查器^{(System File Checker)}自动扫描和修复系统^{(repair system)}文件。SFC是一个内置工具，可让用户删除文件并修复这些错误。^{(these errors.)}然后，按照下面提到的步骤修复Firefox没有响应的问题。

1. 按 Windows 键^{(Windows key)}，键入 命令提示符^{(Command Prompt)} 并单击 以管理员身份运行^{(Run as administrator)}。

 2.在 用户帐户控制^{(User Account Control)} 提示中单击 是。^(Yes)

3. 键入 chkdsk C: /f /r /x 命令并按 Enter 键^{(Enter key)}。

注意：^(Note:) 如果系统提示您，  Chkdsk cannot run...the volume is... in use process，然后，键入 Y 并按 Enter。

4. 键入 sfc /scannow 并按 Enter 键^{(Enter key)} 运行系统文件检查器扫描。

注意：^(Note:) 系统扫描将启动，需要几分钟才能完成。同时，您可以继续执行其他活动，但请注意不要意外关闭窗口。

5. 完成扫描后，将显示以下任一消息：

• Windows 资源保护未发现任何完整性违规。^{(Windows Resource Protection did not find any integrity violations.)}
• Windows 资源保护无法执行请求的操作。^{(Windows Resource Protection could not perform the requested operation.)}
• Windows 资源保护发现损坏的文件并成功修复它们。^{(Windows Resource Protection found corrupt files and successfully repaired them.)}
• Windows 资源保护发现损坏的文件，但无法修复其中一些。^{(Windows Resource Protection found corrupt files but was unable to fix some of them.)}

6. 扫描完成后， 重新启动^(restart) 您的 PC^{(your PC)}。

7. 再次 以管理员身份启动命令提示符^{(Command Prompt as administrator)} 并依次执行给定的命令：

dism.exe /Online /cleanup-image /scanhealth
dism.exe /Online /cleanup-image /restorehealth
dism.exe /Online /cleanup-image /startcomponentcleanup

注意：^(Note:) 您必须具有有效的Internet 连接^{(internet connection)}才能正确执行DISM命令。

方法 6：更新设备驱动程序^{(Method 6: Update Device Drivers)}

如果您系统中的当前驱动程序与浏览器不兼容或已过时，您将面临此无响应错误。因此，建议您更新您的设备和驱动程序^{(device and drivers)}以防止上述问题。

1.在Windows 10 搜索菜单中输入^{(Windows 10 search menu)}设备管理器^{(Device Manager)}并打开它。

2. 双击显示适配器^{(Display adapters)}将其展开。

3. 现在，右键单击驱动程序^{( driver)}，然后单击更新驱动程序^{(Update driver)}。

4. 单击自动搜索驱动程序^{(Search automatically for drivers)}。

5A。如果驱动程序过时，驱动程序将更新到最新版本。

5B。如果它们已经处于更新阶段，屏幕将显示以下消息，已安装适用于您设备的最佳驱动程序^{(The best drivers for your device are already installed)}。

6. 单击关闭^(Close)并重新^(r)启动^(estart) PC。 

检查Firefox启动时无响应问题是否已修复。

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

方法 7：创建新鲜的地方数据库^{(Method 7: Create Fresh Places Database)}

Firefox 浏览器^{(Firefox browser)}中的Places数据库包含有关自动填充表单、书签、保存的密码、浏览数据等的数据。如果此文件在您的计算机上已损坏，您将更频繁地遇到此问题。您可以按照以下步骤尝试创建新的 Places 数据库。

注意：^{(Note: )}当您创建新的Places数据库时，之前文件中存储的所有数据（自动填充表单、书签、保存的密码、浏览数据）都将被清除。如果需要，建议您在执行以下步骤之前创建备份。

1. 启动Firefox并像之前一样单击菜单^{(Menu )}按钮。

2. 现在，从下拉列表中选择帮助选项，如图所示。^{(Help )}

3. 然后，从列表中选择更多故障排除信息^{(More troubleshooting information )}选项，如图所示。

4. 接下来，在Application Basics表中，向下滚动到列表中的Profile Folder菜单，然后单击Open Folder链接，如图所示。

5. 最小化文件管理器^{(File Manager)}并通过单击X图标关闭Firefox 浏览器中的选项卡，如图所示。^{(Firefox browser)}

6. 现在，通过同时按下Ctrl + Shift + Esc键启动^(keys)任务管理器^{(Task Manager)}。

7. 然后，在任务管理器窗口的^{(Task Manager window)}进程选项卡^{(Processes tab)}中，向下滚动并搜索Firefox 任务^{(Firefox tasks)}。

8. 现在，单击在后台运行的Firefox任务。^(Firefox)

9. 最后，点击上图所示的结束任务^{(End Task)}按钮。

10. 转到Windows 资源管理器^{(Windows Explorer)}窗口，向下滚动列表并搜索^{(list and search)}places.sqlite。

11. 然后，右键单击places.sqlite并将其重命名为类似places.sqlite.old 的名称。^{(places.sqlite.old.)}

注意 1：^{(Note 1:)}如果您看到places.sqlite-journal文件，则将其重命名为places.sqlite-journal.old。

注意 2：^{(Note 2:)}此外，如果您在列表中看到places.sqlite-shm或places.sqlite-wal文件，请将它们删除。通常，如果您关闭了所有Firefox^(Firefox)进程，这些文件将不会在列表中弹出。

12. 最后，重新启动Firefox并检查Firefox启动时无响应问题是否已修复。

方法 8：删除会话还原文件^{(Method 8: Delete Session Restore Files)}

Firefox中打开的窗口、选项卡和其他保存信息的所有数据都存储在会话还原^{(Session Restore )}功能中。在创建文件的多个副本之前，所有这些功能都令人难以置信，从而导致了这个问题。在这种情况下，您必须考虑按照以下说明删除这些会话还原^{(Session Restore)}文件，以修复Firefox无响应问题。

1. 打开Firefox并在地址栏中输入about:support以打开Application Basics表。

2.向下滚动^(Scroll)列表并单击^{(list and click)}配置文件文件夹^{(Profile Folder )}菜单旁边的打开文件夹链接，如图所示。^{(Open Folder )}

3. 关闭所有Firefox 窗口和进程，如上方法中的^{(Firefox windows and processes)}步骤 6-9^{(Steps 6–9)}中所做的那样。

4. 再次，转到Windows 资源管理器^{(Windows Explorer)}窗口并单击sessionstore.jsonlz4文件（或类似文件）。然后，选择下面突出显示的删除^{(Delete )}选项以从您的 PC 中删除文件。

注意：^{(Note: )}只有关闭所有Firefox进程，才能看到类似sessionstore.jsonlz4的文件。^{(sessionstore.jsonlz4 )}执行这些步骤时，请务必退出Firefox窗口。^(Firefox)

5. 最后，重新启动浏览器^(browser)并检查Firefox启动时无响应是否已修复。

另请阅读：^{(Also Read:)} 如何在Google Chrome中清除^{(Google Chrome)}缓存和 Cookie^{(Cache and Cookies)}

方法 9：禁用代理^{(Method 9: Disable Proxy)}

使用代理服务器会转移网络，服务器可能需要一些时间来响应您的请求。这可能会触发Firefox没有响应的问题。有很多方法可以在您的计算机上禁用代理服务器。然而，下面解释最简单的方法。

1. 单击开始^(Start)，键入 代理^(Proxy)，然后按Enter 键^{(Enter key)}。

2. 在这里， 关闭^(OFF) 以下设置。

• 自动检测设置^{(Automatically detect settings)}
• 使用设置脚本^{(Use setup script)}
• 使用代理服务器^{(Use a proxy server)}

3. 现在，再次启动Firefox 浏览器^{(Firefox browser)}并检查Firefox启动时无响应问题是否仍然存在。

注意：^(Note:)如果没有，请尝试将您的 PC 连接到其他网络，例如Wi-Fi或移动热点^{(mobile hotspot)}。

方法 10：禁用 VPN^{(Method 10: Disable VPN)}

如果您出于任何原因想要隐藏您的IP 地址，您可以使用^{(IP address)}VPN连接。使用不可靠的VPN 客户端^{(VPN client)}可能会干扰Firefox 浏览器^{(Firefox browser)}，从而导致讨论的问题。因此^(Hence)，在这种情况下，建议您按照以下说明禁用您的VPN 客户端^{(VPN client)}，以修复Firefox没有响应或Firefox右键单击​​无法正常工作的问题。

1. 按 Windows 键^{(Windows key)}， 在Windows 搜索栏中^{(Windows Search Bar)}键入 VPN 设置^{(VPN Settings)}，然后单击 打开^(Open)。

2. 在 设置^(Settings) 窗口中，选择 已连接的 VPN ^{(Connected VPN )}（例如 vpn2）。 

3. 单击 断开连接^(Disconnect) 按钮。

4. 现在， 关闭^(Off)高级选项^{(Advanced Options)} 下  以下 VPN 选项^{(VPN options)}的切换开关：

• 允许通过计量网络使用 VPN^{(Allow VPN over metered networks)}
• 漫游时允许 VPN^{(Allow VPN while roaming)}

最后，检查Firefox启动时无响应问题是否已解决。

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

方法 11：暂时禁用杀毒软件^{(Method 11: Disable Antivirus Temporarily)}

如果防病毒软件干扰了Firefox进程，您将面临一个响应缓慢的网页^{(responding web page)}。要解决此问题，请暂时禁用防病毒程序。^{(antivirus program)}本指南介绍了临时禁用Avast 防病毒程序中的防病毒软件的步骤。^{(antivirus program)}根据您的防病毒程序执行^{(antivirus program)}这些步骤。

注意：^(Note:) 这里 以Avast Free Antivirus 为例。您可以根据您的防病毒应用程序执行这些步骤。

1. 导航到任务栏中的防^(Taskbar)病毒图标^{(Antivirus icon)}并 右键单击 ^{(right-click )}它。

2. 现在，选择 Avast shields control 选项，您可以使用以下选项暂时禁用Avast ：

• 禁用 10 分钟^{(Disable for 10 minutes)}
• 禁用 1 小时^{(Disable for 1 hour)}
• 禁用直到计算机重新启动^{(Disable until computer is restarted)}
• 永久禁用^{(Disable permanently)}

3. 根据您的方便选择选项并确认屏幕上显示的提示。

4. 现在，回到主窗口。在这里，您已关闭Avast的所有屏蔽。要激活设置，请单击 TURN ON。

方法 12：重新启动 Firefox 文件夹^{(Method 12: Reinitiate Firefox Folder)}

您必须通过实施上述方法来解决此问题。不过，如果您再次遇到同样的问题，您可以重命名旧的安装文件，从Firefox 网页^{(Firefox web)}安装新的可执行文件，然后运行安装程序。这肯定会解决问题。如果您不想从浏览器中卸载Firefox 软件包^{(Firefox package)}，但您想使用新的安装程序文件^{(installer file)}，此方法将对您有所帮助。以下是一些重新启动Firefox 安装程序^{(Firefox installer)}文件和修复Firefox无响应问题的说明。

1.访问火狐官方网页^{(Firefox official web page)}，下载安装文件。

2. 现在，通过任务管理器关闭所有^{(Task Manager)}Firefox进程（如前面的方法中所述）并通过同时按Windows + E keys 文件资源管理器^{(File Explorer)}。

3. 导航到路径 C:\Program Files。

注意：^(Note:)导航到安装Mozilla Firefox的路径。

4. 现在，右键单击Mozilla Firefox文件夹并选择重命名^{(Rename )}选项。将文件夹重命名为Old files之类的名称。

5. 现在，导航到下载^{(Downloads )}并双击运行新的 Firefox 可执行文件^{(new Firefox executable file)}。

6.在用户帐户控制^{(User Account Control)}提示中单击是。^(Yes)

7. 现在，在以下提示中单击重新安装。^(Re-install)

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

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

作为核选项，如果这些方法都没有帮助您解决Firefox无响应问题，建议您重新安装Firefox 。以下是从 PC 重新安装浏览器的一些说明。

1. 按Windows键并单击设置^(Settings)图标。

2. 单击应用程序。^(Apps.)

3. 向下滚动并选择Mozilla Firefox。

4. 点击卸载^(Uninstall)。

5. 再次单击弹出窗口中的卸载。^(Uninstall)

6.在 用户帐户控制^{(User Account Control)}提示中单击是。^(Yes)

7. 现在，单击Mozilla Firefox 卸载^{(Mozilla Firefox Uninstall)}向导中的^(Wizard)Next > 按钮 。 

8. 如果出现提示，单击确定^{(OK )}并关闭所有Firefox进程。

9. 现在，点击卸载^(Uninstall)。

10. 最后，单击完成^(Finish) 关闭向导。

11.在Windows 搜索栏中键入^{(Windows search bar)}%localappdata%并单击打开^(Open)。

12. 现在，向下滚动并单击Mozilla文件夹。然后，单击突出显示的删除^{(Delete )}选项。

13. 再次，在Windows 搜索栏中键入^{(Windows search bar)}%appadata%并打开它。

14. 向下滚动并单击Mozilla文件夹。然后，单击前面所做的删除选项。^{(Delete )}

15. 然后，重新启动^(reboot)您的 PC。

16.从官网下载并安装^{(official website)}火狐浏览器^{(Firefox browser)}。

方法 14：联系社区支持论坛^{(Method 14: Contact Community Support Forum)}

如果您使用上述任何方法都无法解决问题，您可以从Firefox崩溃的社区支持论坛^{(Community Support Forum)}寻求帮助。使用您的Firefox 帐户^{(Firefox account)}登录^(Log)。输入问题的详细信息并发布问题。

推荐的：^{(Recommended:)}

• 修复 Firefox 连接重置错误
• 修复 0x80004002： Windows 10^{(Windows 10)}不支持此类接口^{(Interface Supported)}
• 修复 Square Enix 错误代码 i2501
• 修复谷歌浏览器不更新

我们希望本指南对您有所帮助，您可以修复Firefox 没有响应^{(Firefox is not responding)}。让我们知道哪种方法最适合您。继续访问我们的页面以获取更多很棒的提示和技巧，并在下面留下您的评论。让我们知道您希望我们接下来探索哪个主题。

Fix Firefox is Not Responding

If you are looking for a solіd browsing experience, Firefox will be your best choice. The browser’s rich theme and extension support attract so many audienceѕ across the world. Yеt, it does not mean it has no issues either. Sometimes you may face Firefox is not responding issue. If you are also facing the same issue, don’t worry! You are not alone. You can fix this problem yourself with simple and effective troubleshooting methods by following the methods discussed in this article. So, continue reading to fix Firefox not responding on startup issue.

How to Fix Firefox is Not Responding

Here are some reasons that cause this issue. There are plenty of circumstances where you may face the Firefox not responding on startup issue. Nevertheless, a few common and repeated reasons are listed below. Analyze the reason that caused the issue and follow the troubleshooting methods accordingly.

• Bad internet connection.
• A few mandatory rights (rights to create/access files) for Firefox are not granted on your Windows 10 PC.
• The Firefox profile folder is locked in your computer.
• Corrupt Firefox or system files.
• If too many freeware converters (like word to PDF, JPEG to PNG, etc.) are running in the background at the same time.
• Misconfigured database files in Firefox.
• Incompatible add-ons and themes.
• Presence of malware & viruses.
• The Antivirus is blocking Firefox.
• Firefox interferes with other browser settings.
• Too many tabs open at the same time.

Anyways, you can easily resolve this issue by following the below-discussed methods.

In this section, you will get through several effective troubleshooting methods that will help you fix the discussed problem. Follow them in the same order, and since they are arranged from basic troubleshooting methods to advanced, you may attain perfect results even within the first two to three methods themselves.

Basic Troubleshooting Tips

Before trying any advanced troubleshooting methods, try these basic troubleshooting methods. Even a basic method would resolve the issue quickly and more easily.

• Check whether your system is connected to a proper Internet connection.
• Close unnecessary tabs and Firefox windows if there are too many tabs.
• Restart Firefox browser by closing all the browser windows. Along with it, you can end all the Firefox processes in the Task Manager.
• Try opening Firefox in Troubleshoot Mode. To do so, press and hold the Shift key while starting the browser.

Method 1: Switch to Default Theme (If applicable)

There are so many custom themes in Firefox like Dark theme, Firefox Alpenglow, Light, Rawrrr!, That’s So Fire, and a lot more. They may look creative and attractive. But they may cause instability of the browser leading to this issue. If you have any other browser themes rather than the default system theme, follow the below-mentioned steps to switch to the Default theme as instructed below to fix Firefox is not responding issue.

1. Press the Windows key. Type Firefox and open it.

2. Click on the Menu icon as shown.

3. Then, select the Add-ons and themes option as shown.

Note: You can also press Ctrl +Shift + A keys together to open the Add-ons and themes page.

4. Then, select the Themes option in the left pane, and click on the Enable button next to System theme – auto theme as shown.

5. Restart Firefox and check if Firefox not responding on startup problem is solved.

Method 2: Enable Proper Access Rights

If the Firefox profile folder in your computer has not given proper rights to access, write, copy or transfer files, you will face Firefox is not responding issue. First, check if the files and folders of the Firefox profile have proper access rights. If not, rectify the same by following the below-mentioned instructions.

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

2. Now, paste the following path in the address bar.

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

3. Now, right-click on the Profiles folder and select the Properties option as shown.

4. In the Profiles Properties window, uncheck the Read-only (Only applies to files in folder) box in the General tab, as highlighted below.

5. Finally, click on Apply > OK to save the changes and restart your PC.

Also Read: Fix Server Not Found Error in Firefox

Method 3: Delete Parent.Lock File in Profile Folder

When your Firefox browser is crashed or closed, the Firefox lock file is automatically created in the Profile folder. This file will not let you properly operate the Firefox browser, leading to Firefox not responding on startup issues. To resolve the problem, delete the Parent.Lock file in the Firefox Profile folder as instructed below.

Note: Close all the Firefox windows before following the below steps.

1. As discussed in the above method, open the File Explorer and navigate to the following path.

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

2. Then, find the Parent.Lock file by typing it in the Search Profiles field as shown.

3. Then, select all the Parent.Lock files and click on the Delete button as shown.

4. Now, close the browser and reboot your PC and check if Firefox not responding on startup issue persists or not.

Method 4: Run Malware Scan

Malware and virus attacks could be the most probable reason Firefox is not responding. The viruses could interfere and change some crucial files in the Firefox folder, triggering multiple problems. Implement the below-instructed steps by the Windows Defender program to scan your system.

1. Press and hold Windows + I keys together to open Settings.

2. Here, click on Update & Security, as shown.

3. Then, select the Windows Security option in the left pane.

4. Next, select the Virus & threat protection option under Protection areas.

5. Click on Scan Options, as shown.

6. Choose a scan option as per your preference and click on Scan Now.

7A. If there are any threats, click on Start Actions under Current threats.

7B. If you do not have any threats in your system, the system will show the No actions needed alert as highlighted below.

Also Read: How to Fix Firefox Not Loading Pages

Method 5: Repair System Files

You can automatically scan and repair system files by running System File Checker. SFC is a built-in tool that lets users delete files and fix these errors. Then, follow the below-mentioned steps to fix Firefox is not responding issue.

1. Hit the Windows key, type Command Prompt and click on Run as administrator.

2. Click on Yes in the User Account Control prompt.

3. Type chkdsk C: /f /r /x command and hit Enter key.

Note: If you are prompted with a message, Chkdsk cannot run…the volume is… in use process, then, type Y and hit Enter.

4. Type sfc /scannow and press Enter key to run System File Checker scan.

Note: A system scan will be initiated and it will take a couple of minutes to finish. Meanwhile, you can continue performing other activities but be mindful of not accidentally closing the window.

5. After completing the scan, it will show either of these messages:

• Windows Resource Protection did not find any integrity violations.
• Windows Resource Protection could not perform the requested operation.
• Windows Resource Protection found corrupt files and successfully repaired them.
• Windows Resource Protection found corrupt files but was unable to fix some of them.

6. Once the scan is finished, restart your PC.

7. Again, launch Command Prompt as administrator and execute the given commands one after the other:

dism.exe /Online /cleanup-image /scanhealth
dism.exe /Online /cleanup-image /restorehealth
dism.exe /Online /cleanup-image /startcomponentcleanup

Note: You must have a working internet connection to execute DISM commands properly.

Method 6: Update Device Drivers

If the current drivers in your system are incompatible or outdated with the browser, you will face this not responding error. Therefore, you are advised to update your device and drivers to prevent the said problem.

1. Type Device Manager in the Windows 10 search menu and open it.

2. Double-click on the Display adapters to expand it.

3. Now, right-click on the driver and click Update driver.

4. Click Search automatically for drivers.

5A. If the driver is outdated, the drivers will be updated to the latest version.

5B. If they are already in an updated stage, the screen displays the following message, The best drivers for your device are already installed.

6. Click Close and restart PC. 

Check if Firefox not responding on startup issue is fixed or not.

Also Read: How to Fix Firefox Not Playing Videos

Method 7: Create Fresh Places Database

The Places database in the Firefox browser contains data on autofill forms, bookmarks, saved passwords, browsing data, and a lot more. If this file is corrupt on your computer, you will face this issue more often. You can try creating a fresh Places database by following the below-mentioned steps.

Note: When you create a fresh Places database, all the data (autofill forms, bookmarks, saved passwords, browsing data) stored in the previous file will be cleared. You are advised to create a backup if needed before following the below-mentioned steps.

1. Launch Firefox and click on the Menu button as you did earlier.

2. Now, select the Help option from the drop-down list as depicted.

3. Then, select the More troubleshooting information option from the list as shown.

4. Next, in the Application Basics table, scroll down to the Profile Folder menu in the list and click on the Open Folder link as shown.

5. Minimize the File Manager and close the tabs in the Firefox browser by clicking on the X icon as depicted.

6. Now, launch Task Manager by pressing Ctrl + Shift + Esc keys together.

7. Then, in the Processes tab of the Task Manager window, scroll down and search for Firefox tasks.

8. Now, click on the Firefox tasks running in the background.

9. Finally, click on the End Task button as depicted in the above picture.

10. Go to the Windows Explorer window, scroll down the list and search for places.sqlite.

11. Then, right-click on places.sqlite and rename it to something like places.sqlite.old.

Note 1: If you see places.sqlite-journal file, then rename it to places.sqlite-journal.old.

Note 2: Also, if you see places.sqlite-shm or places.sqlite-wal files in the list, delete them. Generally, these files will not pop up on the list if you have closed all the Firefox processes.

12. Finally, relaunch Firefox and check if Firefox not responding on startup issue is fixed or not.

Method 8: Delete Session Restore Files

All the data from the open windows, tabs and other saved information in Firefox is stored in the Session Restore feature. All these features are incredible until multiple copies of the files are created, leading to this issue. In this case, you have to consider deleting these Session Restore files as instructed below to fix Firefox is not responding issue.

1. Open Firefox and type about:support in the address bar to open the Application Basics table.

2. Scroll down the list and click on the Open Folder link next to the Profile Folder menu as shown.

3. Close all the Firefox windows and processes as done in Steps 6–9 in the previous method.

4. Again, go to the Windows Explorer window and click on sessionstore.jsonlz4 files (or something similar). Then, select the Delete option as highlighted below to remove the files from your PC.

Note: You can see files similar to sessionstore.jsonlz4 only if you have closed all the Firefox processes. Don’t fail to quit Firefox windows when you implement these steps.

5. Finally, relaunch the browser and check if Firefox not responding on startup is fixed.

Also Read: How to Clear Cache and Cookies in Google Chrome

Method 9: Disable Proxy

Using proxy servers will divert the network, and the server may take some time to respond to your request. This may trigger Firefox is not responding issue. There are so many methods to disable proxy servers on your computer. Yet, the simplest method is explained below.

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

2. Here, toggle OFF the following settings.

• Automatically detect settings
• Use setup script
• Use a proxy server

3. Now, launch the Firefox browser again and check if Firefox not responding on startup issue persists or not.

Note: If not, try connecting your PC to another network like Wi-Fi or a mobile hotspot.

Method 10: Disable VPN

If you want to hide your IP address for any reason, you can use VPN connections. Using unreliable VPN clients may interfere with Firefox browser, leading to the discussed issue. Hence, in this case, you are advised to disable your VPN client as instructed below to fix Firefox is not responding or Firefox right click not working issue..

1. Hit the Windows key, type VPN Settings in the Windows Search Bar, and click on Open.

2. In the Settings window, select the Connected VPN (e.g. vpn2). 

3. Click on the Disconnect button.

4. Now, switch Off the toggle for the following VPN options under Advanced Options:

• Allow VPN over metered networks
• Allow VPN while roaming

Finally, check if Firefox not responding on startup issue is resolved.

Also Read: How To Fix Firefox Black Screen Issue

Method 11: Disable Antivirus Temporarily

If the antivirus interferes with the Firefox processes, you will face a slow responding web page. To resolve this problem, disable the antivirus program temporarily. This guide explains steps to disable the antivirus in the Avast antivirus program temporarily. Follow the steps according to your antivirus program.

Note: Here, Avast Free Antivirus is taken as an example. You can follow the steps according to your antivirus application.

1. Navigate to the Antivirus icon in the Taskbar and right-click on it.

2. Now, select the Avast shields control option, and you can temporarily disable Avast using the below options:

• Disable for 10 minutes
• Disable for 1 hour
• Disable until computer is restarted
• Disable permanently

3. Choose the option according to your convenience and confirm the prompt displayed on the screen.

4. Now, go back to the main window. Here, you have turned off all shields from Avast. To activate the settings, click on TURN ON.

Method 12: Reinitiate Firefox Folder

You must have attained a solution to this problem by implementing the above-discussed methods. Still, if you face the same problem again, you can rename the old installation files, install a new executable file from the Firefox web page, and run the installer. This will fix the issue for sure. This method will be helpful for you if you do not want to uninstall the Firefox package from the browser, but you want to use a new installer file. Here are some instructions to reinitiate Firefox installer files and fix Firefox is not responding issue.

1. Visit the Firefox official web page and download the installer file.

2. Now, close all the Firefox processes by Task Manager (as discussed in earlier methods) and open the File Explorer by pressing Windows + E keys together.

3. Navigate to path C:\Program Files.

Note: Navigate to the path where Mozilla Firefox is installed.

4. Now, right-click on the Mozilla Firefox folder and select the Rename option. Rename the folder to something like Old files.

5. Now, navigate to Downloads and double-click to run the new Firefox executable file.

6. Click Yes in the User Account Control prompt.

7. Now, click Re-install in the following prompt.

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

Method 13: Reinstall Firefox

As a nuclear option, you are advised to reinstall Firefox if none of the methods have helped you fix Firefox is not responding issue. Here are some instructions to reinstall the browser from your PC.

1. Press the Windows key and click on the Settings icon.

2. Click Apps.

3. Scroll down and select Mozilla Firefox.

4. Click Uninstall.

5. Again, click Uninstall in the pop-up.

6. Click Yes in the User Account Control prompt.

7. Now, click on the Next > button in the Mozilla Firefox Uninstall Wizard.

8. If prompted, click on OK and close all the Firefox processes.

9. Now, click on Uninstall.

10. Finally, click Finish to close the wizard.

11. Type %localappdata% in the Windows search bar and click Open.

12. Now, scroll down and click on the Mozilla folder. Then, click on the Delete option as highlighted.

13. Again, type %appadata% in the Windows search bar and open it.

14. Scroll down and click on the Mozilla folder. Then, click on the Delete option as done earlier.

15. Then, reboot your PC.

16. Download and install the Firefox browser from the official website.

Method 14: Contact Community Support Forum

If you couldn’t resolve the issue with any of the methods above, you can seek help from the Community Support Forum for Firefox crashes. Log in using your Firefox account. Enter the details of the problem and post the question.

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We hope that this guide was helpful and you could fix Firefox is not responding. Let us know which method worked for you the best. Keep visiting our page for more cool tips & tricks, and leave your comments below. Let us know which topic you want us to explore next.

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