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

toolbox #back-forward-dropmarker {
    -moz-appearance: none !important;
    border: none !important;
    display: inline !important;
    padding: 0 !important;
    margin: 0 3px 0 1px !important;
    list-style-image: url("chrome://browser/skin/bf-drop.png") !important;
    -moz-image-region: rect( 0px 7px 32px 0px) !important;
    opacity: 0.7 !important;
}
toolbox #back-forward-dropmarker:hover {
    -moz-appearance: none !important;
    border: none !important;
    opacity: 1.0 !important;
}
toolbox[iconsize="small"] #back-forward-dropmarker {
    padding-top: 1px !important;
    margin: 0 4px 0 1px !important;
    list-style-image: url("chrome://browser/skin/bf-drop-small.png") !important;
    -moz-image-region: rect( 0px 7px 23px 0px) !important;
}
toolbox #back-forward-dropmarker[disabled="true"], 
toolbox #back-forward-dropmarker[disabled="true"]:hover {
    opacity: 0.25 !important;
}