Bug 1547709 Comment 2 Edit History

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Works for me:
mozregression --launch 2019-05-06 --pref network.trr.mode:3 network.trr.uri:"https://mozilla.cloudflare-dns.com/dns-query" network.trr.bootstrapAddress:"2606:4700::6810:f9f9" network.security.esni.enabled:true -a https://www.cloudflare.com/ssl/encrypted-sni/

mozregression --launch 2019-05-06 --pref network.trr.mode:3 network.trr.uri:"https://mozilla.cloudflare-dns.com/dns-query" network.trr.bootstrapAddress:"1.1.1.1" network.security.esni.enabled:true -a https://www.cloudflare.com/ssl/encrypted-sni/

In DoH-only mode, Firefox is not allowed to use regular DNS to resolve the IP address of mozilla.cloudflare-dns.com, so it must be configured manually by the user (via network.trr.bootstrapAddress).
Works for me:
mozregression --launch 2019-05-06 --pref network.trr.mode:3 network.trr.uri:"https://mozilla.cloudflare-dns.com/dns-query" network.trr.bootstrapAddress:"1.1.1.1" network.security.esni.enabled:true -a https://www.cloudflare.com/ssl/encrypted-sni/

In DoH-only mode, Firefox is not allowed to use regular DNS to resolve the IP address of mozilla.cloudflare-dns.com, so it must be configured manually by the user (via network.trr.bootstrapAddress).

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