fix Rated 5 out of 5 stars

@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);
/*remove dropmarker*/
#uctb-toolbar-button .toolbarbutton-menubutton-dropmarker {display: none !important;}
#uctb-tab-button .toolbarbutton-menubutton-dropmarker {display: none !important;}
/*change to smaller icon*/
#uctb-toolbar-button { list-style-image: url("chrome://undoclosedtabsbutton/skin/toolbar-button-small-active.png") !important;
}

This review is for a previous version of the add-on (3.7.1).