In my quest for a solution for the
URL Snooper in combination with wifi, I found that the following solution works:
1. start up URLSnooper; it (still) won't find your wireless NIC.
2. next, start up MediaSniffer; you'll get all the media-url's you 'll need.
MediaSniffer doen't work on it's own either, but seems to get fully enabled when URLSnooper is running.