Mozilla has added an additional DNS provider to its DNS-Over-HTTPS implementation in Firefox. The Trusted Recursive Resolver Program requires DNS providers to adhere to certain security and privacy practices before being approved by Mozilla. This gives Firefox users more options as to which DoH provider they use for secure DNS lookups. Users were concerned that using a single provider decreased user’s privacy and gave that provider too much data about Firefox’s users. Firefox Nightly 73 users can now select NextDNS as a DoH providers.
Source: https://www.bleepingcomputer.com/news/software/mozilla-adds-additional-dns-over-https-provider-to-firefox/