That sounds more like the site then a FF problem. Browsers are constantly updated with security certificates and if that sites fails to update then it will not load.

Does this mean that Apple's security certificate is not being accepted by FF or that FF's policy is not accepting Apple's up-to-date cert?

Safari also is having trouble - it is taking a very long time to find the log-in page.

This suggests the issue is at the Apple site - but I can sign in using Safari on a lap-top!!!??

There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connections and send their own certificate. Update the program. Go to the forum of the program and see if others are having issues.

• 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
• http://kb.mozillazine.org/Error_loading_websites