dl_ext_webstore_console.js

function get_browser() {
    var ua = navigator.userAgent,
        tem, M = ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
    if (/trident/i.test(M[1])) {
        tem = /\brv[ :]+(\d+)/g.exec(ua) || [];
        return {
            name: 'IE',
            version: (tem[1] || '')
        };
    }
    if (M[1] === 'Chrome') {
        tem = ua.match(/\bOPR|Edge\/(\d+)/);
        if (tem != null) {
            return {
                name: 'Opera',
                version: tem[1]
            };
        }
    }
    M = M[2] ? [M[1], M[2]] : [navigator.appName, navigator.appVersion, '-?'];
    if ((tem = ua.match(/version\/(\d+)/i)) != null) {
        M.splice(1, 1, tem[1]);
    }
    return {
        name: M[0],
        version: M[1]
    };
}

var browser = get_browser();
var browser_version = browser.version + '.0';
var href = location.href;
if(href.includes('?')) {
    href = href.substring(0, href.indexOf('?'));
}
var ext_id = href.match(/([^\/]*)\/*$/)[1];
var final_url = 'https://clients2.google.com/service/update2/crx?response=redirect&prodversion=' + browser_version + '&x=id%3D' + ext_id + '%26installsource%3Dondemand%26uc';

window.location.href = final_url;