i just experienced this issue myself. Firefox seems to kill the content of the div when the CSS display property is set to 'none'. Hope this doesn't come too late to help you.
I was able to fix this by modifying the following CSS (my change is in red):
Code:
.sliderwrapper .contentdiv{display:block !Important;
visibility:hidden;position:absolute;left:0;top:0;/*required*/
filter:progid:DXImageTransform.Microsoft.alpha(opacity=100);-moz-opacity:1;opacity:1;width:984px;height:688px;background:transparent;}
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