None of thethese suggestions above worked for me in Firefox v101. What worked for me is changing the value of security.tls.version.min from 3 to 1 in about:config.
[NOTE: After I changed this setting, Firefox initially redirected from http to https. But this time Firefox allowed me to "accept the risk and continue," which wasn't possible when security.tls.version.min was set to 3. --end note]
See also: https://support.mozilla.org/en-US/questions/1116550