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Better solution that what I first posted:
Goto the template manager and clone the default template set.
Then edit the ct_dhtml_site_nav_block.html file
Here is the new code:
<style type="text/css" media="screen">
@import "tanfa.css";
/**************** menu coding *****************/
#menu {width: 100%;} /* Width of Individual Menu */
#menu ul ul {
border:1px solid #FF9933;
background-color:#C3CEE1;
margin-top:5px;} /* style of submenus */
/*******No Need To Edit Below Here***********/
#menu ul {list-style: none;margin: 0;padding: 0;}
#menu li {position: relative; [b]list-style: none;[/b]}
#menu ul ul {position: absolute;top: 0;left: 100%;width: 100%;}
<{$block.cssul1}>{display: none;}
<{$block.cssul2}>{display: block;}
/***** General formatting only ****/
style>
<table class="blocks" cellspacing="1" cellpadding="0" width="100%">
<tr>
<td id="mainmenu">
<div id="menu">
<{$block.ct_menu}>
div>td>
tr>
table>
All I added is in bold.
Then in the General Settings, select your new template set and the DHTML menu in FF is fixed.
As to the MSIE font issue: something here looks odd to me with the tags and bracket
