Can you please check this: https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can This is the most likely issue, corrupted cookies : https://support.mozilla.org/en-US/kb/fix-login-issues-on-websites-require-passwords Can you try this please and also the Refresh https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems?redirectlocale=en-US&redirectslug=Troubleshooting+extensions+and+themes Please let us know if this solved your issue or if need further assistance.

Disregard