SEC_ERROR_UNKNOWN_ISSUER on school district website
When attempting to access https://www.muasd.org which is a school district website I get the warning message with the reason stated above as SEC_ERROR_UNKNOWN_ISSUER. This happens on version 79 also on the enterprise quantum version as well as android firefox app. We took a brand new computer out of the box installed firefox while connected to a phone hotspot and received the same error. All other browsers work fine. Any help would be appreciated.
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There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own.
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
Websites don't load - troubleshoot and fix error messages
http://kb.mozillazine.org/Error_loading_websites