如果在Windows 10/8.1Mozilla Firefox网络浏览器时，您会收到无法加载 XPCOM^{(Couldn’t load XPCOM)}错误消息，那么每次运行它时，您可能需要尝试排除并修复问题。

Firefox 无法加载 XPCOM

XPCOM 是一种跨平台的组件对象模型，类似于Microsoft COM，是文件和内存管理、基本数据结构等所必需的。

此Firefox启动错误通常会在执行Windows 系统还原^{(Windows System Restore)}后或在Sandbox中运行时发生。事实上，在我让系统恢复我的电脑几次以解决其他一些问题之后，几天前我也收到了这条消息。

1]以安全模式启动并查看

打开Firefox 菜单^{(Firefox Menu)}，单击“？”帮助^(Help)按钮并选择禁用插件后重新启动^{(Restart with addons disabled)}。如果这解决了您的问题，您可能需要禁用一些导致问题的插件。

2]创建一个新的Firefox配置文件

创建一个新的 Firefox 配置文件^{(Create a new Firefox profile)}，看看是否可以解决问题。

3]重置火狐

重置 Firefox，看看是否对您有帮助。

4]卸载并重新安装Firefox

如果没有任何帮助，您可能需要重新安装 Firefox^{(fresh-install Firefox)}。

将您的书签和保存的密码备份到安全位置。卸载火狐^(Firefox)。选择删除^(Remove)我的Firefox个人数据和自定义选项。请记住^(Remember)，执行此操作时，所有个人资料文件夹都将被删除，您将丢失书签和密码等个人数据。因此^(Hence)我说——先备份它们。

检查程序文件文件^{(Program Files)}夹。删除 C^{(Delete C)} :\Program files\Mozilla Firefox或 C:\ Program Files (x86)\Mozilla Firefox，视您的情况而定。

如果您在计算机上看到以下文件夹，也请删除它们。可能是隐藏文件夹，您可能必须通过文件夹选项^{(Folder Option)}取消隐藏它们：

• C:\Users\用户名\AppData\Local\Mozilla\Firefox
• C:\Users\用户名\AppData\Local\Mozilla\updates
• C:\Users\用户名\AppData\Local\VirtualStore\Program Files\Mozilla Firefox

使用免费软件CCleaner之类的安全注册表清洁器来清除 PC 垃圾并清除Windows 注册表^{(Windows Registry)}中残留的Firefox条目。

从其官方网站下载后，重新启动您的Windows计算机并全新安装Firefox 。

再说一遍——只需在现有安装的基础上安装最新的 Firefox 版本也会有所帮助。它至少对我有用。^{(Then again – simply installing the latest Firefox version over your existing installation can also help. It worked for me at least.)}

也想看看这些吗？^{(Want to have a look at these too?)}

1. Mozilla Firefox 在 Windows 上不断变慢^{(Mozilla Firefox keeps slowing down on Windows)}
2. 恢复已删除的 Firefox 书签^{(Restore Deleted Firefox Bookmarks)}
3. 您在 Firefox 中的连接不安全
4. Firefox 在 Windows 上冻结或崩溃^{(Firefox Freezing or Crashing on Windows)}。

Firefox couldn't load XPCOM in Windows 11/10

If when rυnning your Mozilla Firefox web browser on Windows 10/8.1, you receive a Couldn’t load XPCOM error message, every time you run it, here are a few things you may want to try to troubleshoot and fix the issue.

Firefox couldn’t load XPCOM

XPCOM is a cross-platform component object model, which is similar to Microsoft COM, and is required for file and memory management, basic data structures and so on.

This Firefox start-up error can typically occur after performing a Windows System Restore or if you run it in a Sandbox. In fact I too received this message a few days back after I had the system restore my computer a couple of times to fix some other issues.

1] Start in Safe Mode and see

Open Firefox Menu, click the “?” Help button and select Restart with addons disabled. If this solves your issue, you may need to disable some problem-causing addon.

2] Create a new Firefox profile

Create a new Firefox profile and see if that makes the problem go away.

3] Reset Firefox

Reset Firefox and see if that helps you.

4] Uninstall and reinstall Firefox

If nothing helps, you may have to fresh-install Firefox.

Back up your bookmarks and saved passwords to a safe location. Uninstall Firefox. Select the Remove my Firefox personal data and customizations option. Remember that when you do this, all profile folders will be removed and you will lose personal data like bookmarks and passwords. Hence I said – back them up first.

Check the Program Files folder. Delete C:\Program files\Mozilla Firefox or C:\Program Files (x86)\Mozilla Firefox, as your case may be.

Also delete the following folders if you see them on your computer. The may be hidden folders and you may have to unhide them via Folder Option:

• C:\Users\username\AppData\Local\Mozilla\Firefox
• C:\Users\username\AppData\Local\Mozilla\updates
• C:\Users\username\AppData\Local\VirtualStore\Program Files\Mozilla Firefox

Use a safe registry cleaner like freeware CCleaner to clear PC junk and to clean the Windows Registry of residual Firefox entries.

Restart your Windows computer and fresh-install Firefox, after downloading it from its official website.

Then again – simply installing the latest Firefox version over your existing installation can also help. It worked for me at least.

Want to have a look at these too?

1. Mozilla Firefox keeps slowing down on Windows
2. Restore Deleted Firefox Bookmarks
3. Your connection is not secure in Firefox
4. Firefox Freezing or Crashing on Windows.

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