And disable WebRTC because of local IP address leakage. Check yours at http://net.ipcalf.com/ :-)
99% of people are going to be in 192.168.1.0/24 or 10.1.1.0/24. so it only takes 508 guesses.... not to mention that everyone is 127.0.0.1.
EDIT: FF: about:config, media.peerconnection.enabled => false
edit: Now my ip is reported as "ifconfig | grep inet | grep -v inet6 | cut -d" " -f2 | tail -n1" which is amusing.