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Dexmaster / Download videos

// ==UserScript==
// @name        Download videos
// @namespace   openuserjs.org
// @description adds download button
// @include    http://study.com/academy/*
// @author     Dexmaster
// @version    0.0.11
// @grant      none
// @run-at     document-end
// ==/UserScript==

function vidStarter(){
    var videoContainers = document.querySelectorAll('.videoContainer');
    if(videoContainers && videoContainers.length){
        Array.prototype.forEach.call(videoContainers, function(el, i){
            timer(el, i);
        });
    }
}

function timer(el, indx, count){
    if(isNaN(count)){
        count = 8;
    }
    if(count > 0){
        setTimeout(function() {
            checkVid(el, indx, count-1);
        }, 1000);
    }
}

function makeTitle(){
    var headChaps = document.querySelectorAll('.pageNavigation .left-content:not(.hidden-xs) .crumb:not(.transcriptLink)'),
        headTitle = document.querySelector('.headerTitle'), fileName = '';
    if(headChaps && headChaps.length){
        Array.prototype.forEach.call(headChaps, function(el, i){
            fileName += el.textContent.trim() + ' - ';
        });
    }
    fileName += headTitle.textContent.trim();
    return fileName.replace(/\s/g,' ');
}

function checkVid(el, indx, count){
    if(el.querySelector('video source')){
        var chldEl = document.createElement("a");
        chldEl.href = el.querySelector('video source').src;
        chldEl.download = makeTitle() + ' video-' + indx  + '.mp4';
        chldEl.target = '_blank';
        chldEl.style = 'position: absolute; z-index: 9999; top: 17px; right: 75px; display:block; width: 35px; height: 35px; box-shadow: 0px 1px 3px #999; ' +
            'border-radius: 35px; background-image: url(http://icons.iconarchive.com/icons/graphicloads/100-flat-2/256/arrow-download-icon.png); background-size: 100%; content: " "';
        el.appendChild(chldEl);
    } else {
        //console.log(el.querySelector('video source'), count);
        timer(el, indx, count);
    }
}

setTimeout(vidStarter, 1000);