[Home]

http://blog.vlad1.com/2008/02/04/getting-bookmark-icons-back-on-your-toolbar/

Just add the following to your UserChrome.css file:

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

.bookmark-item > .toolbarbutton-icon {
display: -moz-box ! important;
background-position: 0px 1px !important;
}

.bookmark-item:hover > .toolbarbutton-icon {
background: url("chrome://global/skin/toolbar/toolbarbutton-customhover-mid.png") repeat-x;
}

.bookmark-item[container]:hover:active > .toolbarbutton-icon,
.bookmark-item[container][open="true"] > .toolbarbutton-icon {
background: url("chrome://browser/skin/bookmark-open-mid.png") repeat-x !important;
}