Where is the problem when a new installed firefox on a fresh system says "SECURE CONNECTION FAILED"?
Win10 x64 Enterprise Chrome and IE work how they should
httpS sites cannot be loaded, normal http sites are no problem.
Firefox was fresh installed, at first try the profile of a old Win8 PC (Firefox 60.0.0.1) was copied to %appdata%/Mozilla/Firefox to have the passwords (Masterpassword enabled) The error message is "SECURE CONNECTION FAILED"?
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Please provide public link(s) (no password) that we can check out. No Personal Information Please !
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
Often, "Secure Connection Failed" means "Connection Failed (trying to load a
secure page)". In other words, not a security problem, just a connection problem.