chrome.runtime.onMessage.addListener( function(request, sender, sendResponse) { if (request.message === 'ytvideoid') { SponsorsLookup(request.id); } }); function SponsorsLookup(id) { v = document.querySelector('video') var xmlhttp = new XMLHttpRequest(); xmlhttp.open('GET', 'https://officialnoob.github.io/YTSponsorSkip-Dataset/' + id, true); xmlhttp.onreadystatechange = function () { if (xmlhttp.readyState == 4 && xmlhttp.status == 200) { Sponsors = JSON.parse(xmlhttp.responseText); v.ontimeupdate = function () { SponsorCheck() }; } }; xmlhttp.send(null); } function SponsorCheck() { Sponsors.forEach(function (el, index) { if ((Math.floor(v.currentTime)) == el[0]) { v.currentTime = el[1]; } }); }