Why does Firefox use dynamic ports in the 50K+ range when I use it to browse the web? I have included screen shots with netstat -AB as well as currports. Furthermore, if I set a rule in Windows Firewall blocking outbound traffic on ports 50000 - 65535, it breaks DNS with Firefox, even though 53 UDP is open. I'm not overly concerned with any connection that is localhost / 127.0.0.1. I've tried prohibiting these ports by modifying user.js - No impact, only works if I implicitly call out the port (example.com:55000) What do? Why is FF using these ports?