why does firefox not connect to mail.com ? any ideas how to fix thanks in advance. Server Not Found Firefox can’t connect to the server at 6938e629511d9131a58e28150289aa0a.safeframe.googlesyndication.com.

This is a part of Google's Analytics and Ad delivery services. It's possible you have these blocked in some form (e.g. I do).

You might want to lower the protections when you're on that login page from the shield icon next to the address and disable enhanced tracking protections for it.