> If you'd like to standardise a way to require DNS-over-HTTPS in supporting software, and convince operating system distributors to generally ship it, I'm fairly sure Firefox would be up for using that rather than its current mechanism, similar to how it uses system proxy settings. As it is there is no such standard.

There already is a standard way for me to tell all the programs which run on my system which DNS servers to use: /etc/resolv.conf. Any program which does not respect the values I set there is disobeying me.