Enanium: consolidated jBox and toolbar CSS. Firefox 3.5 did a double-request and it was slowing things down. Thanks YSlow.
.mcePageBreak {display:block;border:0;width:100%;height:12px;border-top:1px dotted #ccc;margin-top:15px;background:#fff url(../img/pagebreak.gif) no-repeat center top;}