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Upcoming Firefox release will start sending all your DNS requests to Cloudflare

https://blog.ungleich.ch/en-us/cms/blog/2018/08/04/mozillas-new-dns-resolution-is-dangerous/

Looks like this will override local resolvers and therefore break any LAN only domains (as well as sending data to a US company).

Details on how to change this in about:config here https://blog.nightly.mozilla.org/2018/06/01/improving-dns-privacy-in-firefox/