Why is Firefox is blocking safe web sites including mozilla?

I keep getting security warnings on several web sites, even mozilla, and I can't override it,and I can't get it to accept the security certificate. Both of my laptops are fine, it is only on my desktop PC.

hello craigbutcher, first please make sure that the date & time is set correctly on your system. if this doesn't solve the issue (or it is already set properly), a possible solution depends on different factors:
* what is the '''error code''' shown under ''technical details'' on the error page?
in case the error code equals ''sec_error_unknown_issuer'', please attempt to add an exception on the bottom of the error page & inspect the certificate (see the screenshot attached for instructions):
* which '''issuer information''' does the certificate contain?
thank you!
[["This Connection is Untrusted" error message appears - What to do]]

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