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Feature Request: Firefox doesn't display informative error for failed DoH requests

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The great thing about DNS over HTTPS is that it's done at Application Layer. However, Firefox doesn't leverage this - producing a boilerplate response when DNS response failed.

I'm using NextDNS with P O R N category blocked, with https://dns.nextdns.io/XXXX as my TRR (and network.trr.mode is "3")

When NextDNS does its job and responds with Server failed, Firefox should be able to produce an informative response to the user, rather than "Firefox can’t establish a connection to the server at P O R N .com." which is more about connectivity than DNS failure.

Feature Request: Firefox be more informative DoH DNS failures?

Stretch Feature Request: if network.trr.mode is "2", Firefox passively notifies user that preferred method failed.

The great thing about DNS over HTTPS is that it's done at Application Layer. However, Firefox doesn't leverage this - producing a boilerplate response when DNS response failed. I'm using NextDNS with P O R N category blocked, with https://dns.nextdns.io/XXXX as my TRR (and network.trr.mode is "3") When NextDNS does its job and responds with Server failed, Firefox should be able to produce an informative response to the user, rather than "Firefox can’t establish a connection to the server at P O R N .com." which is more about connectivity than DNS failure. Feature Request: Firefox be more informative DoH DNS failures? Stretch Feature Request: if network.trr.mode is "2", Firefox passively notifies user that preferred method failed.