@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

toolbarbutton[type="menu-button"] > toolbarbutton,
toolbarbutton[type="menu-button"] > dropmarker {
  border: 1px solid transparent !important;
}

toolbarbutton[type="menu-button"]:hover > toolbarbutton,
toolbarbutton[type="menu-button"]:hover > dropmarker {
  border-color: ThreeDHighlight ThreeDShadow ThreeDShadow ThreeDHighlight !important;
}

toolbarbutton[type="menu-button"][open="true"] > toolbarbutton,
toolbarbutton[type="menu-button"][open="true"] > dropmarker {
  border-color: ThreeDHighlight ThreeDShadow ThreeDShadow ThreeDHighlight !important;
}

toolbarbutton[type="menu-button"]:hover:active,
toolbarbutton[type="menu-button"]:hover > toolbarbutton:active,
toolbarbutton[type="menu-button"][open="true"] > dropmarker {
  border-color: ThreeDShadow ThreeDHighlight ThreeDHighlight ThreeDShadow !important;
}