Indeed. I wish, just like for Firefox, there was an extension which could tell me what protocol I am using.

As far as I know, Firefox does not discriminate nor positively favor neither IPv6 or IPv4. So far, this is what has given me the best IPv6 experience, and I'm very disappointed Google/Chrome has decided to do their best to conceal from the internet that there are users out there, and that they are ready.

IPv6 deployment is largely a chicken and the egg type of problem and IMO this decision doesn't really help.