-#toolbox-dock-bottom {
- list-style-image: url("chrome://browser/skin/devtools/dock-bottom.png");
- -moz-image-region: rect(0px, 16px, 16px, 0px);
-}
-
-#toolbox-dock-bottom:hover {
- -moz-image-region: rect(0px, 32px, 16px, 16px);
+#toolbox-dock-buttons > toolbarbutton > image {
+ width: 16px;
+ height: 16px;
+ background-size: 32px 16px;
+ background-position: 0 center;
+ background-repeat: no-repeat;