Seems like a good reason to not use Firefox.
-----
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
Midwest-IX
http://www.midwest-ix.com
From: niels=nanog@bakker.net
To: nanog@nanog.org
Sent: Wednesday, September 26, 2018 6:34:44 AM
Subject: Re: CloudFlare D.N.S. Resolvers... (1.1.1.1 & 1.0.0.1)
* nanog@ics-il.net (Mike Hammett) [Wed 26 Sep 2018, 13:14 CEST]:
>I recommend that eyeball networks don't run any external recursive
>server for optimal CDN performance. Yes, some CDNs support other
>methods, but not all. If not all do, then the requirement remains.
+1
https://blog.powerdns.com/2018/09/04/on-firefox-moving-dns-to-a-third-party/
-- Niels.