scrollbar colour

Hi,
I tried pasting the below, which I got from a thread on this list, into the Custom Javascript box under Misc Settings, but with no effect.
Is there API docs for this plugin, or a complete list of customisations?
Thank you.

jQuery(document).ready(function($) {
var nice = $(“#cff”).niceScroll({
cursorcolor: “#ff8409”,
cursorwidth: “8px”,
cursorborder: “0px solid #1e1f23”,
cursorborderradius: “5px”,
cursorfixedheight: “70”,
scrollspeed: 60,
autohidemode: false,
bouncescroll: true
});
});

https://ww.wp.xz.cn/plugins/custom-facebook-feed/