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Mozilla published a list of requirements that companies need to meet if they want to be included as Trusted Recursive Resolvers for Firefox's upcoming DNS-over-HTTPS feature.

DNS-over-HTTPS aims to improve user privacy, security and the reliability of connections by sending and receiving DNS information using HTTPS.

Mozilla ran a Shield study in 2018 to test the DNS-over-HTTPS implementation in Firefox Nightly versions. The organization selected Cloudflare as its partner for the study after Cloudflare agreed to Mozilla's requirements to not keep records or sell or transfer data to third-parties.

Firefox users may configure DNS-over-HTTPS in the browser. Mozilla plans to make it the default in Firefox going forward; while that is beneficial overall, doing so comes with its own set of issues and concerns.

* Firefox will use the feature for DNS related activities and not the DNS configured on the computer. Means: local hosts files, resolvers, or custom DNS providers will be ignored.

* The selection of Cloudflare as the first partner was controversial.

Mozilla plans to make DNS-over-HTTPS the default in the Firefox web browser. Firefox users may still disable the feature once Mozilla makes the switch from off to on though.