在Firefox上浏览多个网站时遇到问题？他们主要是在HTTPS上吗？如果您收到错误消息，MOZILLA PKIX ERROR MITM DETECTED或ERROR SELF SIGNED CERT或SEC ERROR UNKNOWN ISSUER，则意味着Firefox无法信任在安全网站上颁发的证书。

这意味着您的系统或网络上的某些东西正在拦截您的连接并注入证书。发生这种情况时，Firefox不信任它。这通常发生在恶意软件试图用其证书替换合法证书时。令人惊讶的是，安全软件也会发生这种情况。他们密切关注安全连接并制造误报。例如：

In Microsoft Windows accounts protected by Family Safety settings, secure connections on popular websites like Google, Facebook and YouTube might be intercepted and their certificates replaced by a certificate issued by Microsoft in order to filter and record search activity.

类似地，在公司网络中，可能有一个监控/过滤产品可以替代证书。

阅读^(Read)：什么是中间人 (MITM) 攻击^{(Man In The Middle (MITM) attacks)}？

MOZILLA_PKIX_ERROR_MITM_DETECTED

多个用户在使用Nightly 版本的 Firefox^{( Nightly version of Firefox)}时报告了此问题。如果是这种情况，请尝试仅使用稳定版本访问安全网站。特别是，如果它与付款有关。但是，如果您不这样做，您可以尝试以下两种解决方案。

1]在您的杀毒软件^(Anit-Virus)和安全软件中关闭^(Turn)HTTPS 扫描^{(HTTPS Scanning)}

每个基于安全^(Security)的软件都有一个安全^(Security)选项。它允许您关闭 HTTPS扫描功能。它们以不同的名称提供。我在下面提到了其中的一些：

• HTTPS 扫描
• 扫描 SSL
• 显示安全结果
• 不扫描加密连接

通过访问他们的帮助部分，确保^(Make)找到适用于您的安全软件的内容。

2]禁用^(Disable) security.enterprise_roots.enabled

您还可以在Firefox上禁用^(Firefox)HTTPS证书检查。再次^(Again)，不推荐，但如果你必须这样做的话。

•  在Firefox地址栏中输入 about:config，然后回车。
• 确认信息消息以防出现。
• 搜索首选项 security.enterprise_roots.enabled。
• 当你找到它时，双击它并将其值更改为 true 并重新启动 firefox 一次

这会将来自任何其他安全软件的所有自定义证书导入Firefox。反过来，这将确保将这些来源标记为可信，并且不会引发任何错误。

让我们知道这有助于您修复 MOZILLA_PKIX_ERROR_MITM_DETECTED 与多个 HTTPS 网站。^{(Let us know this helped you to fix MOZILLA_PKIX_ERROR_MITM_DETECTED with multiple HTTPs websites.)}

Fix MOZILLA_PKIX_ERROR_MITM_DETECTED error on Firefox

Having trоuble browsіng multiple webѕites on Firefox? Are they mostly on HTTPS? If you receive error message, MOZILLA PKIX ERROR MITM DETECTED or ERROR SELF SIGNED CERT or SEC ERROR UNKNOWN ISSUER, then it means that Firefox is not able to trust certificates issued on secured websites.

This means that something on your system or network is intercepting your connection and injecting certificates. When that happens, Firefox does not trust it. This usually happens when malware tries to replace a legitimate certificate with its certificate. Surprisingly, this also happens with security software. They keep a tab on a secure connection and create a false positive. For example:

In Microsoft Windows accounts protected by Family Safety settings, secure connections on popular websites like Google, Facebook and YouTube might be intercepted and their certificates replaced by a certificate issued by Microsoft in order to filter and record search activity.

Similarly, in a corporate network, there might be a monitoring/filtering product which could be replacing certificates.

Read: What are Man In The Middle (MITM) attacks?

MOZILLA_PKIX_ERROR_MITM_DETECTED

Multiple users have reported this issue when using the Nightly version of Firefox. If that’s the case, try accessing secure websites with stable build only. Especially, if its related to payments. However, if you are not doing that, here are two solutions you can try.

1] Turn off HTTPS Scanning in your Anit-Virus & Security Software

Every Security based software has a Security option. It allows you to turn off HTTPS scanning functionality. They are available under different names. I have mentioned a few of them below:

• HTTPS Scanning
• Scan SSL
• Show safe result
• Do not scan encrypted connections

Make sure to find what is applicable for your security software by visiting their help section.

2] Disable security.enterprise_roots.enabled

You can also disable HTTPS certificate check on Firefox. Again, not recommended, but do it if you have to do it.

• Type about: config in the Firefox address bar, and hit enter.
• Confirm the info message in case it shows up.
• Search for the preference security.enterprise_roots.enabled.
• When you find it, double-click it and change its value to true and restart firefox once

This will import all custom certificates from any other security software into Firefox. This, in turn, will make sure to mark those sources as trusted, and it will not throw any error.

Let us know this helped you to fix MOZILLA_PKIX_ERROR_MITM_DETECTED with multiple HTTPs websites.

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