This could be a problem with the TLS 1.3 Early Data feature also known as Zero Round Trip Time Resumption (0rtt). You can try to set <b>security.tls.enable_0rtt_data = false</b> on the <b>about:config</b> page to disable this feature until this is fixed by Google or Mozilla to see if that helps. *https://support.mozilla.org/en-US/kb/about-config-editor-firefox See also: *[/questions/1376015] Issue with most Google sites on Firefox v100 64bit