How to set up an IPv6 proxy for Firefox?

Question

proxy

Hello!
Can you please tell me how to set up a proxy in Firefox? I can not.
I bought two proxies Type: IPv6 since it is the cheapest, I specify it in the Mozilla settings in the HTTP field, I go to the site asking for a login and password - I enter it, but 2ip.ru shows my real IP ...
How to configure it correctly ??
Thanks in advance!

Answer 1

Are you sure that ipv6 works for you https://test-ipv6.com/index.html.ru_RU