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

#main-window[tabsontop="true"][sizemode="maximized"] #appmenu-button { 
  width: 88px !important;  
  min-height:26px!important;
  margin-bottom: -9px !important;
  border-radius: 4px 4px 0 0!important;
  border-top: 2px solid rgba(83,42,6,.9)!important;
  -moz-border-top-colors:  rgba(255,255,255,0) rgba(83,42,6,.9)!important;
  -moz-border-bottom-colors: rgba(255,255,255,0) rgba(83,42,6,0)!important;
}