--- a/toolkit/themes/gnomestripe/global/toolbar.css
+++ b/toolkit/themes/gnomestripe/global/toolbar.css
@@ -59,16 +59,17 @@ toolbar {
 
 menubar, toolbar[type="menubar"] {
   -moz-appearance: menubar;
   min-width: 1px;
   min-height: 20px;
   padding: 1px 0px;
 }
 
+menubar:-moz-lwtheme,
 toolbar:-moz-lwtheme {
   -moz-appearance: none;
 }
 
 /* in browser.xul, the menubar is inside a toolbar... */
 toolbaritem > menubar {
   -moz-appearance: none;
 }

--- a/toolkit/themes/pinstripe/global/toolbar.css
+++ b/toolkit/themes/pinstripe/global/toolbar.css
@@ -40,16 +40,17 @@
 @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
 
 toolbar {
   min-width: 1px;
   min-height: 20px;
   -moz-appearance: toolbar;
 }
 
+menubar:-moz-lwtheme,
 toolbar:-moz-lwtheme {
   -moz-appearance: none;
   background: none;
   border-style: none;
 }
 
 menubar {
   -moz-appearance: dialog; /* For content menubars, "toolbar" is too dark, so we use "dialog". */

--- a/toolkit/themes/winstripe/global/toolbar.css
+++ b/toolkit/themes/winstripe/global/toolbar.css
@@ -69,16 +69,17 @@ toolbar {
 toolbar:first-child, menubar {
   min-width: 1px;
   border-bottom: 1px solid ThreeDShadow;
   border-top: 0px !important;
 }
 
 /* ::::: lightweight theme ::::: */
  
+menubar:-moz-lwtheme,
 toolbox:-moz-lwtheme,
 toolbar:-moz-lwtheme {
   -moz-appearance: none;
   background: none;
   border-style: none;
 }
 
 /* ::::: toolbar decorations ::::: */