--- a/browser/themes/windows/browser-aero.css
+++ b/browser/themes/windows/browser-aero.css
@@ -168,17 +168,17 @@
          * impossible to know by how much. */
         .titlebar-button > .toolbarbutton-icon {
           width: 10.8px;
           height: 10.8px;
         }
       }
 
       @media (-moz-windows-default-theme) {
-        #main-menubar > menu {
+        #main-menubar > menu[_moz-menuactive="true"] {
           color: inherit;
         }
 
         #main-menubar > menu[_moz-menuactive="true"],
         .titlebar-button:hover {
           background-color: hsla(0,0%,100%,.22);
         }
         .titlebar-button:hover:active {