视差无法在Firefox上运行

Question

(function ($) {
    var $container = $(".parallax");
    var $divs = $container.find("div.parallax-background");
    var liHeight = $divs.eq(0).closest("li").height();
    var diffHeight = $divs.eq(0).height() - liHeight;
    var i, len, div, li, offset, scroll, top;
    var render = function () {
        top = $(window).scrollTop();
        for (i = 0, len = $divs.length; i < len; i++) {
            div = $divs[i];
            li = div.parentNode;
            offset = $(div).offset().top;
            scroll = Math.round(((top - offset) / liHeight) * diffHeight);
            div.style.webkitTransform = "translate3d(0px," + scroll + "px,0px)";
        }
    };
    (function loop() {
        requestAnimationFrame(loop);
        render();
    })();
})(jQuery);

我发现了一个脚本并试图弄清楚为什么它不适用于firefox。能帮到我吗？