下面是原來一直在用的css style
到了firefox 4就沒效了...
a:visited:after 的content 怎樣改都不成功
各位大大有解決方法嗎?
thanks!

原本的css
==============

html
{
background: url(back.gif) repeat-x;
}

body
{
width: 90%;
margin: 30px auto;
}

*
{
font-family: "Trebuchet MS", "Verdana", sans-serif;
}

p
{
color: #000;
}

.item-desc img
{
border: 1px solid #ddd;
padding: 5px;
height: auto;
max-width: 90%;
}

#rss-header
{
background: #455372 !important;
margin: 0 0 32px 0;
-moz-border-radius: 8px;
border-right: 1px solid #333;
border-bottom: 1px solid #333;
padding: 10px;
}

#rss-header a, #rss-header p
{
color: #fff;
text-decoration: none;
margin: 0;
}

#rss-header p
{
font-size: 10pt;
padding-left: 1em;
padding-right: 1em;
}

h1
{
font-weight: normal;
margin: 0;
font-size: 12pt;
}

h1:before
{
content: "Newsfeed: ";
color: #ccc;
}

h2.item-title
{
border-bottom: 1px solid #ddd;
color: #000;
display: block;
font-family: "Trebuchet MS", "Verdana", sans-serif;
font-size: 10pt;
font-weight: normal;
min-height: 1.3em;
padding: 10px 0 0 0;
}

h2.item-title a
{
color: #000;
text-decoration: none;
}

h2.item-title a:visited:after
{
color: #777777;
content: " - visited";
font-size: 10px;
}

div.item
{
background: #E4ECEC;
border: 0;
border-bottom: 1px solid #D2D6D6;
border-right: 1px solid #D2D6D6;
-moz-border-radius: 8px;
color: #333;
font-size: 8pt;
margin-bottom: 10px;
padding: 0 5px 5px 5px;
position: relative;
float: left; width: 45%;
margin-left: 1%;
margin-right: 1%;
left: auto;
right: auto;
}

.item-pubDate
{
background: #FAF4C8;
border-right: 1px solid #E3DE9F;
border-bottom: 1px solid #E3DE9F;
color : #777;
float: right;
font-size: 7pt;
font-weight: bold;
line-height: 1.1em;
padding: 2px 3px 5px 3px;
position: absolute;
right: 3pt;
text-align: center;
top: 3pt;
}

item-technorati
{
font-size: x-small;
margin: 0px;
text-align: right;
}

.item-ordinal
{
color: #777;
}