How do I enable Secure SNI
I did a check at https://www.cloudflare.com/ssl/encrypted-sni/
Wšě wotmołwy (2)
You should contact their support on how to do this setup. Firefox doesn't control how cloudflare setups their secure connections.
Firefox does support echConfig, but your current DNS service may not support it.
Do you have enabled DNS over HTTPS ?
Wot cor-el