Some users are having trouble with Google sites because of the TLS 1.3 Early Data feature also known as Zero Round Trip Time Resumption (0rtt). You could try changing this preference to false. You may have to restart the browser. security.tls.enable_0rtt_data https://support.mozilla.org/en-US/questions/1377212 https://support.mozilla.org/en-US/kb/about-config-editor-firefox You could also try clearing cookies (which will mean having to log in again) and the cache. https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox https://support.mozilla.org/en-US/kb/how-clear-firefox-cache Some troubleshooting articles. https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems (also deals with hardware acceleration) https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles