Panel-UI Button durch Firefox-Logo ersetzen

#PanelUI-menu-button .toolbarbutton-icon {


  background-image: url("data:image/x-icon;base64,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"),                   


                    -moz-radial-gradient(rgba(255,255,255,0)0, rgba(255,255,255,0.5)0),           


                    -moz-linear-gradient(rgba(255,255,255,0)0, rgba(255,255,255,0)0) !important;


 


  background-repeat: no-repeat !important;


  background-position: center, center, 1px 0px, 0, 0, 0, 0!important;


  margin-right:2px!important;


  margin-left:5px!important;


  margin-top:0px!important;


  margin-bottom: 0px !important;


  border: none !important;


  list-style-image: none!important;


}