Looks like you don't have conflict considerations on your JQuery custom.js. I get an error of:

Uncaught TypeError: el.visible is not a function
    at HTMLDivElement.<anonymous> (customjs.js:2131)
    at Function.each (jquery.js:2)
    at a.fn.init.each (jquery.js:2)
    at thefox_animation (customjs.js:2129)
    at HTMLDocument.<anonymous> (customjs.js:33)
    at i (jquery.js:2)
    at Object.fireWith [as resolveWith] (jquery.js:2)
    at Function.ready (jquery.js:2)
    at HTMLDocument.K (jquery.js:2)

This could be helpful in troubleshooting: 

Line 2 of your custom.js:

var j$ = jQuery;
j$.noConflict()

isn't 100% correct as the more correct way of doing no conflict, a better example  would be what you have lower down in the script:

(function (j$) {
        j$.fn.visible = function (partial) {
            var j$t = j$(this),
                j$w = j$(window),
                viewTop = j$w.scrollTop(),
                viewBottom = viewTop + j$w.height(),
                _top = j$t.offset().top + 100,
                _bottom = _top + j$t.height(),
                compareTop = partial === true ? _bottom : _top,
                compareBottom = partial === true ? _top : _bottom;
            return ((compareBottom <= viewBottom) && (compareTop >= viewTop));
        };
    })(jQuery);

 where you have (jQuery); at the end.