--- a/browser/themes/winstripe/browser/browser-aero.css
+++ b/browser/themes/winstripe/browser/browser-aero.css
@@ -153,19 +153,19 @@
   #toolbar-menubar:not([autohide="true"]),
   #TabsToolbar[tabsontop="true"],
   #navigator-toolbox[tabsontop="false"] > #nav-bar,
   #nav-bar + #customToolbars + #PersonalToolbar[collapsed="true"] + #TabsToolbar[tabsontop="false"]:last-child,
   #navigator-toolbox > toolbar:not(#toolbar-menubar):-moz-lwtheme {
     -moz-binding: url("chrome://global/content/bindings/toolbar.xml#toolbar-drag");
   }
 
-  #browser:not(:-moz-lwtheme),
   #browser-bottombox:not(:-moz-lwtheme) {
     background-color: -moz-dialog;
+    background-clip: padding-box;
   }
 
   #main-menubar:not(:-moz-lwtheme):not(:-moz-window-inactive) {
     background-color: rgba(255,255,255,.5);
     border-radius: 4px;
   }
 
   #urlbar,