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Netrics / Disable Polymer YouTube

// ==UserScript==
// @name        Disable Polymer YouTube
// @description Disabled the new 2017 YouTube Redesign (polymer) from appearing on page load.
// @author      Jason Maggiacomo
// @license     MIT
// @version     1.0
// @match       *://*.youtube.com/*
// @run-at      document-start
// @grant       none
// ==/UserScript==

try {
    var url = document.location.toString();
    var updateUrl = updateQueryStringParameter(url, 'disable_polymer', 'true');
    document.execCommand('Stop'); //helps improve some performance
    if (url != updateUrl) {
        document.location = updateUrl;
    }
} catch (e) {}

function updateQueryStringParameter(uri, key, value) {
    var re = new RegExp("([?&])" + key + "=.*?(&|$)", "i");
    var separator = uri.indexOf('?') !== -1 ? "&" : "?";
    if (uri.match(re)) {
        return uri.replace(re, '$1' + key + "=" + value + '$2');
    } else {
        return uri + separator + key + "=" + value;
    }
}