https://blog.ungleich.ch/en-us/cms/blog/2018/08/04/mozillas-new-dns-resolution-is-dangerous/ Ключевое:
Mozilla's new DNS resolution is dangerous
All your DNS traffic will be sent to Cloudflare
Mozilla wants to override any configured DNS server with Cloudflare
So let’s get to the new Firefox feature called "Trusted Recursive Resolver" (TRR). When Mozilla turns this on by default, the DNS changes you configured in your network won't have any effect anymore. At least for browsing with Firefox, because Mozilla has partnered up with Cloudflare, and will resolve the domain names from the application itself via a DNS server from Cloudflare based in the United States. Cloudflare will then be able to read everyone's DNS requests.
Add: дополнительно по этому поводу можно увидеть тут:
https://klink0v.livejournal.com/481775.html?thread=3076335
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