The Curl 7.0 Facebook network explorer has a problem obtaining a login throught the default Mozilla HTTPS library.
Let it fail, but take the URL that fails (it uses an https scheme) and paste it into Galeon (a Mozilla-Gecko based browser).
Login to the Network Explorer using your Facebook credentials as usual.
I could not get this to work using Seamonkey or firefox browsers.
When the applet starts, I do get a Curl error, but I just click Continue and all is well (as far as I can see thus far)