Why does Firefox no longer allow for a provision to remove the: "This connection is not secure." message?

Hello, Firefox used to provide a way to remove the: "This connection is not secure." warning message for sites that are using "http". Believe me, I understand the need for security, but when the site is an internal, intranet site behind a firewall, why is there no longer a provision to turn this warning message off? This makes no sense to me. I have no problem with the "Not Secure" indicator up near the URL. That makes sense. Chrome does this, but they don't assume every "http" site is most likely dangerous. Again, I'm talking about "http" sites that are internal, intranet sites that can only be used by people inside their firewall. Thank you, -Joe Hummer