> I am trying to capture a URL from an https site, but
> I can't get past the "Capture URL" option - the

It can't capture a httpS.

> I'm running on Linux Mint 14 Nadia, 64-bit machine,
> recent install.

This link describes how to get cookies into FF on windows, you may be able to
do something similar: Unable to get HTTrack past login redirect page - HTTrack
Website Copier Forum
<http://forum.httrack.com/readmsg/29365/index.html>