Firefox browser by default install doesn't block user from sites unless the site has been reported to sites are malware infected site. So since there is no screenshot error or login errors no one knows what site or what is going on here.

I am 72 years old. was blocked from my email supplier of 20 years as his security cert must have expired. The link to go around it did not work so I had to use Chrome. I don't appreciate being blocked. Notified is fine.