Why am I suddenly getting this message from a page I have been using for 6 months(Error code: sec_error_unknown_issuer) how do I get my page back?

Why am I suddenly getting this message from a page I have been using for 6 months(Error code: sec_error_unknown_issuer) how do I get my page back?

Did you reset Firefox recently?
*https://support.mozilla.org/kb/reset-firefox-easily-fix-most-problems
If that is the case then you may have lost intermediate certificates that were stored in the cert8.db file in the Firefox profile folder.
Check out why the site is untrusted (see the Technical details) and if this is caused by a missing intermediate certificate then see if you can install this intermediate certificate from another source.
Some firewalls monitor secure (https) connections and send their own certificate instead of the website's certificate.
You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.
*Click the link at the bottom of the error page: "I Understand the Risks"
Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate".
*Click the "View..." button and inspect the certificate and check who is the issuer.
You can see more Details like intermediate certificates that are used in the Details pane.

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