makes DNS query of your own hostname
on startup torbrowser 4.0 does DNS query of your own hostname. should not be needed.
(Linux x86_64, queried hostname is output of /bin/hostname, nameserver 127.0.0.1 in /etc/resolv.conf) I have denied with iptables connections to 127.0.0.0/8 except to 127.0.0.1 tcp 9150:9151. This is why I noticed packets to udp port 53.