Windows XP SP3, Firefox 3.6.8. Using a custom Sync server, the Weave minimal server written by Toby Elliot. Firefox Sync 1.4.4 extension is crapping out at the setup stage. I've got a self-signed SSL certificate behind my web server, since it's for my personal use. I have the Sync extension on a couple of other Firefox installations, grandfathered through a few versions since Weave. Those extensions work and I can sync, no problem. So the problem is not with my server itself, or with my username, or with my password. As I said, all three work fine with other Firefox installs. This new setup process won't let me get past the "invalid HTTPS cert" error. Must I sign my cert with a certificate authority of my own, or will even that be marked as invalid? Any guidance would be appreciated.