[Bug 584529]

[matteo sisti sette]

Reply to comment 1: Exact same behavior after setting
network.dns.disableIPv6=true (and restarting Tb) (tested twice)

Regarding comment 2: too much work to test, however the premise
"connection is established upon first network request" doesn't make any
sense to me. Also note the fourth step in "steps to reproduce".

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https://bugs.launchpad.net/bugs/584529

Title:
  Thunderbird complains there is no connection on resume from suspend,
  when there is a connection

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