--- a/toolkit/themes/osx/global/toolbar.css
+++ b/toolkit/themes/osx/global/toolbar.css
@@ -18,21 +18,18 @@ toolbar:-moz-lwtheme {
 }
 
 menubar {
   -moz-appearance: dialog; /* For content menubars, "toolbar" is too dark, so we use "dialog". */
   min-width: 1px;
 }
 
 toolbarseparator {
-  -moz-appearance: none;
+  -moz-appearance: separator;
   margin: 3px 4px;
-  background-color: ThreeDShadow;
-  padding: 0;
-  width: 1px !important;
 }
 
 /* ::::: toolbarpaletteitem ::::: */
 
 toolbarpaletteitem {
   cursor: grab;
 }
 
@@ -51,9 +48,8 @@ toolbarpaletteitem[place="toolbar"] {
 
 toolbarpaletteitem[dragover="left"] {
   border-left-color: #000000;
 }
 
 toolbarpaletteitem[dragover="right"] {
   border-right-color: #000000;
 }
-