gecko-dev/themes/modern/global/scrollbars.css

@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul); /* set default namespace to XUL */

/********* XP Scrollbar *********/

scrollbar {
   -moz-binding: url("chrome://global/content/xulBindings.xml#scrollbar");
}

/********* XP Scrollbar *********/

thumb {
  -moz-binding: url(chrome://global/content/xulBindings.xml#thumb);
  background-color: #CCCCCC;
  border: 1px outset #CCCCCC;
  list-style-image: url("chrome://global/skin/scroll-thumb-horiz.gif")
}

thumb[disabled="true"] {
   list-style-image: url("chrome://global/skin/scroll-thumb-horiz-disabled.gif");
}

thumb[align="vertical"] {
   list-style-image: url("chrome://global/skin/scroll-thumb-vert.gif")
}

scrollbarbutton {
  vertical-align: bottom;
  cursor: default;

  border: 1px outset white;
  background-color: #CCCCCC;
  color:black; 

  padding: 1px;
}

scrollbarbutton:active {
  border-style: inset;

  padding-left: 2px;
  padding-right: 0px;
  padding-top: 2px;
  padding-bottom: 0px;
}

scrollbarbutton[type="decrement"] {
   list-style-image: url("chrome://global/skin/scroll-left.gif")
}

scrollbarbutton[type="decrement"][disabled="true"] {
   list-style-image: url("chrome://global/skin/scroll-left-disabled.gif") 
}

scrollbarbutton[type="increment"] {
   list-style-image: url("chrome://global/skin/scroll-right.gif")
}


scrollbarbutton[type="increment"][disabled="true"] {
   list-style-image: url("chrome://global/skin/scroll-right-disabled.gif") 
}


scrollbar[align="vertical"] scrollbarbutton[type="decrement"] {
   list-style-image: url("chrome://global/skin/scroll-up.gif")
}

scrollbar[align="vertical"] scrollbarbutton[type="decrement"][disabled="true"] {
   list-style-image: url("chrome://global/skin/scroll-up-disabled.gif") 
}

scrollbar[align="vertical"] scrollbarbutton[type="increment"] {
   list-style-image: url("chrome://global/skin/scroll-down.gif")
}

scrollbar[align="vertical"] scrollbarbutton[type="increment"][disabled="true"] {
   list-style-image: url("chrome://global/skin/scroll-down-disabled.gif") 
}

slider[align="vertical"] thumb:active {
   background-color: #CCCCCC;
}

slider {
   background-color: #999999;
}