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Check that "network.trr.mode" is set to "0" in "about:config" to disable firefox using DNS over HTTPS (DoH). It was introduced in Firefox 62 I think.


You're better off setting it to "5". From https://wiki.mozilla.org/Trusted_Recursive_Resolver :

"Set `network.trr.mode` to 2 to make DNS Over HTTPS the browser's first choice but use regular DNS as a fallback (0 is "off by default", 1 lets Firefox pick whichever is faster, 3 for TRR only mode, 5 to explicitly turn it off)."




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