--- a/toolkit/themes/windows/global/dropmarker.css
+++ b/toolkit/themes/windows/global/dropmarker.css
@@ -3,32 +3,22 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 dropmarker {
   -moz-appearance: menulist-button;
   width: 16px;
   height: 16px;
   -moz-box-align: center;
   -moz-box-pack: center;
-  border: 2px solid;
-  -moz-border-top-colors: ThreeDLightShadow ThreeDHighlight;
-  -moz-border-right-colors: ThreeDDarkShadow ThreeDShadow;
-  -moz-border-bottom-colors: ThreeDDarkShadow ThreeDShadow;
-  -moz-border-left-colors: ThreeDLightShadow ThreeDHighlight;
-  background-color: -moz-Dialog;
   padding: 1px;
   list-style-image: url("chrome://global/skin/arrow/arrow-dn.gif");
   -moz-image-region: auto;
 }
 
 dropmarker:hover:active:not([disabled="true"]) {
-  -moz-border-top-colors: ThreeDShadow ThreeDFace;
-  -moz-border-right-colors: ThreeDShadow ThreeDFace;
-  -moz-border-bottom-colors: ThreeDShadow ThreeDFace;
-  -moz-border-left-colors: ThreeDShadow ThreeDFace;
   padding-top: 2px;
   padding-bottom: 0px;
   padding-inline-start: 2px;
   padding-inline-end: 0px;
 }
 
 dropmarker[disabled="true"] {
   list-style-image: url("chrome://global/skin/arrow/arrow-dn-dis.gif");