[Bug 1796979]

[Rex]

Hey Michal, sorry if I completely misunderstand, but does your hook ask
the system to resolve the address before firefox makes the attempt? I
have a hunch that, where firefox would fail to resolve an address, if
another program or service had already resolved the address, firefox
would succeed.

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

Title:
  Intermittently can't connect to the server

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