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".
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".