Windows 10 已于2025年10月14日停止支持。如果您正在使用 Windows 10,参见 这篇文章

Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

搜索 | 用户支持

防范以用户支持为名的诈骗。我们绝对不会要求您拨打电话或发送短信,及提供任何个人信息。请使用“举报滥用”选项报告涉及违规的行为。

详细了解
Solved 已存档

firefox is useless - says EVERY site has bad certificate - even MOZILLA will not load

FredMcD 已回复
handyman321

The owner of mozilla.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

The owner of www.google.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

The owner of www.msn.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

The owner of mozilla.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website. The owner of www.google.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website. The owner of www.msn.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

所有回复 (2)

Hi, sounds like some corruption in a file. Please : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files , C:\Program Files(x86) & C:\ProgramData Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :

Reinstall with Current Release Firefox 59.0.2 with a Full Version Installer

Please let us know if this solved your issue or if need further assistance.

选择的解决方案

There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connections and send their own certificate.

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites

https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message

https://support.mozilla.org/en-US/kb/connection-untrusted-error-message

http://kb.mozillazine.org/Error_loading_websites


  • uses an invalid security certificate SSL_ERROR_BAD_CERT_DOMAIN
  • configured their website improperly

How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER