Ah welcome to the world of persistent connections...................in the beginning of browse life and Tim Berners Lee all HTML objects fetched from a web server - were done on one or two persistent connections....to fetch images, text, cookies etc tec.

Then along came Microsoft with I.E and thought - we can speed up our browser - by opening many connections ...the more the merrier......so that you have a stream of TCP flows for each web site.

This is dependent on your browser S/w - and trying to shut them down or stop them will interfere with your experience of the web sites you visit

So Netscape/Mozilla prefers less persistent connections, Microsoft likes lots.......c'est la vie