TCPView and ZoneAlarm firewall reveal that Firefox is accepting incoming connections on two ports on localhost (127.0.0.1). The port numbers are not fixed.
I reinstalled Firefox without any add-ons, and scanned using 3 antivirus programs (Avast, AVG and Norton), but Firefox is still listening to two ports. Other browsers such as Opera, K-Meleon, IE and Safari do not behave like this.
Is something spying on my system?