BLESS your heart for there being a 9.3 version available.
I did customize the cookie names - and then cleared my cookies, but it's not helping. i did highly customize and modify the theme - but all that entailed was changing out the images and changing the colors in the css files - nothing of that nature should (to my knowledge) break a theme.
So maybe it's some odd legacy code in the old 9.2 EQII theme itself that isn't playing nicely with 9.3x? I have no clue.
But I will try to redo my theme modification with the newer version, and see if that helps!
It is really odd though that it works in IE8 and not in FF 13.0.1 very frustrating for me since I never like to use IE in general.
Server specs (Server OS / Apache / MySQL / PHP / DragonflyCMS):
[ Linux / Apache 2.2.8 / MySQL 5.0.45 / PHP 5.2.6 / CPG 8.2b - 18.104.22.168]
Joined: Jun 29, 2004