Secure DNS option

Gael explained some DNS options in his blog post. Mozilla are testing a secure DNS and trusted recursive resolver (TRR) with Cloudflare. It's currently in beta and I've been using it it Nightly for a while and it works well.

Is this an option for eelo? I don't know if it can be used only in Firefox or in the whole OS.

https://blog.nightly.mozilla.org/2018/06/01/improving-dns-privacy-in-firefox/

EDIT: since the issue is now covering other options I've removed reference to Mozilla in the title.