Firefox and System [4] listening on !

Its Sona from India. I am a linux user basically but due to some works i am using windows 7 now with free comodo internet security and Defense+. Today when i viewed the firewall connections of Comodo i saw two suspicious TCP connections one from system 4 on port 139 and another from firefox on port 49177.

After searching web a bit got to know i should disable NetBios over TCP/IP but after doing the same nothing changed.

What are the possibilities and solutions ?

Thanks and regards