Just seeing this now.
Some FYIs
Firefox 3.5 and higher has an issue with certificates, I work with installing applications and clients (laptops/pcs) and new browsers are always tested for all applications that are in use in an office before we roll them out. IE8 and FF 3.5.2 have caused issues with certs, sometimes the UAC fix works, sometimes it doesnt, for some apps, FF doesnt work at all if its https, but you can get the IE6 or IE7 plugin so it does which is a type of a workaround.