pjs/mailnews/ui/messenger/resources/threadPane.css

window {
 display: block;
 background-color: white;
 background-image: url(http://web.mit.edu/stars.gif);
}

tree {
 display: table;
 border: none;
 border-spacing: 0px;
 //border-collapse: collapse;
 width: 100%;
}

treeitem { 
 display: table-row; 
} 

treehead { 
 display: table-header-group; 
} 

treebody { 
 display: table-row-group; 
} 

treecell { 
 display: table-cell; 
 color: white;
 font-family: Verdana;
 font-size: 10pt;
} 

treecell[selectedcell] { 
 background-color: #666699; 
 color: white;
} 

treeitem[Status="new"] {
	font-weight: bold;
}

treehead treeitem treecell { 
 font-size: 9pt;
 background-color: #666699; 
 border: thin darkgray solid; 
 color: white;
} 

icon {
 display: list-item;
 list-style-image: url(http://www.shadowland.org/client/images/ClosedRead.gif);
}

treeitem > treecell > titledbutton {
 vertical-align: bottom;
 list-style-image: url("resource:/res/mailnews/messenger/mailMessage.gif");
}