[Bug 1796979]

[Rex]

:michal, it took about 5 seconds to compile and did not return anything
to the terminal.

:dragana, yes, I did not seem to be able to resolve any addresses and
only hit server not found pages. Though I had not tested with an IP
address as my network.trr.uri, testing now shows the same thing. To be
transparent, my only changes are network.trr.mode to 3, and
network.trr.uri as default or to 104.16.249.249 or 1.1.1.1, and the rest
of network.trr.* default. Maybe I am missing or misusing a setting?

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https://bugs.launchpad.net/bugs/1796979

Title:
  Intermittently can't connect to the server

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