Https (sec_error_unknown_issuer) sites display problem

Lately, I have upgradet Windows 8.1 to 10. First of all, it seemed all right.
But when I opened Firefox and wanted to open Google.com I got sec_error_unknown_issuer error.
First of all, I cleared my cache. But it did not work after that. So I uninstalled Firefox and installed it again.
The error message is still there.

Sorry for the inconvenience. Many users are updating their security software or activate the parental control during or shortly after their upgrade to Windows 10 and Firefox may need to be put in place to work with these changes.

Using Avast, BitDefender, ESET or Kaspersky Security software?

If not, could you try to disable the parental controls from Microsoft: http://windows.microsoft.com/en-us/windows-10/turn-off-microsoft-family-settings

Tags: Firefox

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