javascript - Button is not displaying in FireFox -

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i using button triggers 4-5 other buttons animation. working fine in chrome not in firefox

i have used fullscreen background video in current project, button, in firefox, when inspect elements, shows there, browser not displaying element @ all.

inspiration taken - http://codepen.io/phenax/

'use strict'; (function (document, win) {     var animation_time = 600;     var btn_move_limit = 30;     var item_showing = false;     var classname = {         show_items: 'menu--list__show',         revolve: 'menu--list__revolve',         button_cross: 'bar__crossy'     };     var $el = {         toggle_btn: document.queryselector('.js-menu--toggle'),         menu_items: document.queryselector('.js-menu--list'),         items: document.queryselectorall('.js-item')     };     var constrain = function constrain(val, lim) {         return val > lim ? lim : val < -lim ? -lim : val;     };     var setbuttonposition = function setbuttonposition(left, top) {         $el.toggle_btn.style.left = constrain(left, btn_move_limit) + 'px';         $el.toggle_btn.style.top = constrain(top, btn_move_limit) + 'px';     };     var showallitems = function showallitems() {         var item_menu = $el.menu_items.classlist;         item_menu.add(classname.show_items);         settimeout(function () {             item_menu.add(classname.revolve);             $el.toggle_btn.classlist.add(classname.button_cross);             item_showing = true;         }, animation_time);     };     var hideallitems = function hideallitems() {         var item_menu = $el.menu_items.classlist;         item_menu.remove(classname.revolve);         $el.toggle_btn.classlist.remove(classname.button_cross);         settimeout(function () {             item_menu.remove(classname.show_items);             item_showing = false;             setbuttonposition(0, 0);         }, animation_time);     };     var findposrelative = function findposrelative(e) {         e = e.pagex ? {             pagex: e.pagex,             pagey: e.pagey         } : e.touches[0];         var offset = {             x: win.innerwidth / 2,             y: win.innerheight / 2         };         e.pagex = e.pagex - offset.x;         e.pagey = e.pagey - offset.y;         return e;     };     var menubtnclickhandler = function menubtnclickhandler() {         if (item_showing)             hideallitems();         else             showallitems();     };     var itemclick = function itemclick(e) {         var item_id = e.target.dataset.id;         console.log('item id: ' + item_id);         hideallitems();     };     var mousemovement = function mousemovement(e) {         var left, top;         if (item_showing) {             e = findposrelative(e);             left = 140 * e.pagex / win.innerwidth;             top = 140 * e.pagey / win.innerheight;         } else {             left = 0;             top = 0;         }         setbuttonposition(left, top);     };     document.addeventlistener('domcontentloaded', function () {         $el.toggle_btn.addeventlistener('click', menubtnclickhandler);         (var = 0; < $el.items.length; i++) {             if (window.cp.shouldstopexecution(1)) {                 break;             }             $el.items[i].addeventlistener('click', itemclick);         }         window.cp.exitedloop(1);         win.addeventlistener('mousemove', mousemovement);         win.addeventlistener('touchmove', mousemovement);     }); }(document, window)); 
.menu--toggle {     position: absolute;     width: 80px;     height: 80px;     border-radius: 50%;     transform: translatex(-50%);     border: none;     outline: none;     cursor: pointer;     left: 0;     top: 0;     color: #222;     z-index: 1;     background-image: url("../images/logo/logo.jpg");     background-position: center;     background-size: cover;     box-shadow: 0 0 0 rgba(204, 169, 44, 0.4); }  .menu {   position: absolute;   left: 50%;   top: 50%;   transform: translate(-50%, -50%);   margin-top: -80px;   filter: url("#svgfilter"); }   .menu .item {     position: absolute;     width: 80px;     height: 80px;     border-radius: 50%;     transform: translatex(-50%);     border: none;     outline: none;     cursor: pointer;     left: 0;     top: 0;     background-color: #ffeb3b;     color: #222; }   .menu .item {     transition: 0.6s ease-in-out; }   .menu--toggle {     transition: .2s linear; }     .menu--toggle .bar {       width: 20px;       height: 2px;       background-color: #222;       margin: 5px auto;       transition: 0.6s ease-in-out; }     .menu--toggle.bar__crossy .bar:nth-child(2) {       opacity: 0; }     .menu--toggle.bar__crossy .bar:nth-child(1) {       transform: translatey(7px) rotate(45deg); }     .menu--toggle.bar__crossy .bar:nth-child(3) {       transform: translatey(-7px) rotate(-45deg); }   .menu--list ul {     list-style-type: none;     padding: 0;     margin: 0; }   .menu--list li {     position: absolute;     width: 60px;     height: 80px;     transition: 0.6s ease-in-out;     transform-origin: 0% 50%; }   .menu--list__show .item {     margin-left: 60px; }   .menu--list__revolve li:nth-child(1) {     transform: rotate(90deg); }     .menu--list__revolve li:nth-child(1) .item {       transform: rotate(270deg); }   .menu--list__revolve li:nth-child(2) {     transform: rotate(180deg); }     .menu--list__revolve li:nth-child(2) .item {       transform: rotate(180deg); }   .menu--list__revolve li:nth-child(3) {     transform: rotate(270deg); }     .menu--list__revolve li:nth-child(3) .item {       transform: rotate(90deg); }   .menu--list__revolve li:nth-child(4) {     transform: rotate(360deg); }     .menu--list__revolve li:nth-child(4) .item {       transform: rotate(0deg); } 
 <div class="menu">                     <nav class="menu--list js-menu--list">                         <ul>                             <li><button type="button" onclick="window.open('https://www.facebook.com/themadhousecafe', '_blank')" class="fa fa-facebook item js-item" data-id="1"></button></li>                             <li><button type="button" onclick="window.open('http://blog.nomadbaker.com/', '_blank')" class="fa item js-item" data-id="2">blog</button></li>                             <li><button type="button" onclick="window.open('#', '_blank')" class="item js-item" data-id="3">menu</button></li>                             <li><button type="button" onclick="window.open('#', '_blank')" class="fa fa-phone item js-item" data-id="4"></button></li>                         </ul>                     </nav>                     <button type="button" class='logo_button menu--toggle js-menu--toggle'>                         <div class="bar"></div>                         <div class="bar"></div>                         <div class="bar"></div>                      </button>                 </div>


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