--- a/browser/themes/windows/browser.css
+++ b/browser/themes/windows/browser.css
@@ -628,17 +628,18 @@ toolbar .toolbarbutton-1 > .toolbarbutto
 %ifdef WINDOWS_AERO
 @media (-moz-os-version: windows-vista),
        (-moz-os-version: windows-win7) {
 %endif
   /* < Win8 */
   #nav-bar .toolbarbutton-1 > .toolbarbutton-icon,
   #nav-bar .toolbarbutton-1 > .toolbarbutton-text,
   #nav-bar .toolbarbutton-1 > .toolbarbutton-badge-container,
-  #nav-bar .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-icon {
+  #nav-bar .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-icon,
+  #nav-bar .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon {
     background-color: hsla(210,32%,93%,0);
     background-origin: padding-box;
     border-radius: 2px;
     border-color: hsla(210,54%,20%,0) hsla(210,54%,20%,0) hsla(210,54%,20%,0);
     box-shadow: 0 1px hsla(0,0%,100%,0) inset,
                 0 1px hsla(210,54%,20%,0),
                 0 0 2px hsla(210,54%,20%,0);
     transition-property: background-color, border-color, box-shadow;