Firefox going ahead with enabling DoH by default with only one alternative provider to CloudFlare. https://www.theverge.com/2020/2/25/21152335/mozilla-firefox-dns-over-https-web-privacy-security-encryptio

Now the majority of Firefox users have unknowingly bought into a security bargain to exchange the trust of their local ISP for CloudFlare or NextDNS. Since I wrote my last blog post last year about the announcement this was being rolled out, Mozilla has still done fuck-all to fix the issue of limited providers who all have a history of censorship and surveillance. Their "stringent requirements" for who can be one of their DoH providers are complete bullshit if they are okay with CloudFlare. I'd recommend disabling DoH entirely in the meantime unless you have your own trustworthy provider that you've manually configured.
https://write.pixie.town/thufie/in-cloudflare-we-trust

#FuckCloudFlare