Hmm, will some type of a near-term event (say, a FF) cause Firefox to abandon this privacy setting implementation?

Firefox rolling out DNS-over-HTTPS privacy by default in the US
by John E Dunn
naked security by Sophos
28 FEB 2020

[snip]

Mozilla has said it plans to make a privacy technology called DNS-over-HTTPS (DoH) the default setting for US users of Firefox within weeks.

As our previous coverage explains, DoH encrypts Domain Name System (DNS) queries, which browsers use to resolve website addresses to their underlying numeric IP addresses.

Normally, these requests are sent in the clear, which means that ISPs and governments can see which web domains someone is visiting, which is where the privacy concerns begin.

In the US, ISPs have been accused of selling this data to advertisers. Although not a perfect shield against DNS snooping, DoH makes that a lot harder.