Getting the "Your Connection is not Secure" message for all websites, including support.mozilla.org
Started late last week. I get the error message for any website that I try to go on. It also comes up when I click on the "Learn More..." link on the error message page.
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What else does it say?
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