How do you mean email on Firefox doesn't come up? Firefox is just a Browser only. What exactly is the issue or error that it's saying? Also since that is a login any posting should have private info blackout so anyone reading can diagnosis what is really happening.

I believe the OP is referring to the centurylink webmail. ex: https://webmail.centurylink.net/app/

This question has been locked because the original author has deleted their account. While you can no longer post new replies, the existing content remains available for reference.