Thaks for the replies! I'm still stuck with this. As soon as I get any result I will post it.
PaulS:
I wonder, though, if the data you are after is available some other way. Or, perhaps, is not really intended for you to get at.
As far as I've read that information is supposed to be freely available. I keep wondering how does Firefox manages to get the info. As you've said It seems not to be an easy task to figure that out.
SurferTim:
.js is a javascript file. I will presume the url is designed to be loaded into an iframe on another page. Just a guess.
I will keep that in mind!