--- a/toolkit/themes/linux/global/findBar.css
+++ b/toolkit/themes/linux/global/findBar.css
@@ -1,17 +1,16 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
 
 findbar {
-  border-top: 2px solid;
-  -moz-border-top-colors: ThreeDShadow ThreeDHighlight;
+  border-top: 1px solid ThreeDShadow;
   min-width: 1px;
   transition-property: margin-bottom, opacity, visibility;
   transition-duration: 150ms, 150ms, 0s;
   transition-timing-function: ease-in-out, ease-in-out, linear;
 }
 
 findbar[hidden] {
   /* Override display:none to make the transition work. */