Removing the rule that set the scrollbar's thumb to be green. Whoever

checked that in is a tool.

xpfe/global/resources/skin/xul.css

@@ -945,7 +945,7 @@ thumb[disabled="true"] {
 }
 
 slider[align="vertical"] thumb {
-   background-color: green;
+   background-color: rgb(206,207,206);
    list-style-image: url(chrome://global/skin/scroll-thumb-vert.gif)
 }