Disqus helper functions for client-side generation of session id (see https://gist.github.com/gabalafou/66f04297c0f03dee7d20)

get-navigation-time.js

function getNavigationTime() {
    var timing = window.performance && window.performance.timing;
    
    // this method is expected to return a big number, so do this in any case
    if (!timing)
        return 1e5;
    
    var timing = window.performance.timing;
    var dns = timing.domainLookupEnd - timing.domainLookupStart;
    var connection = timing.connectEnd - timing.connectStart;
    var navigation = timing.responseStart - timing.navigationStart;
    
    // multiply values by random prime numbers just to decrease likelihood of
    // making the same sum by different summands
    return dns * 11 + connection * 13 + navigation * 17;
}

random.js

function random() {
    try {
        // get cryptographically strong entropy when available (CryptoAPI)
        var ab = new Uint32Array(1);
        return window.crypto.getRandomValues(ab)[0];
    } catch (e) { // could throw QuotaExceededError if too much entropy is drained
        // fallback to old way
        return Math.floor(Math.random() * 1e9);
    }
}

reduce-misc-session-metrics.js

function reduceMiscSessionMetrics() {
    // wrap in try/catch just to make sure it won't break anything in some exotic browser
    try {
        // The time-zone offset is the difference, in minutes, between UTC and local time
        var offset = new Date().getTimezoneOffset();
        var screenRes = 1,
            screen = window.screen;
        if (screen && screen.availWidth) {
            screenRes = screen.availWidth * screen.availHeight + screen.colorDepth;
        } else if (screen && screen.width) {
            // screen.availWidth is not supported on mobile devices
            screenRes = screen.width * screen.height;
        }
        var doc = document.documentElement,
            browser = doc.clientWidth * doc.clientHeight;
        // multiply values by random prime numbers just to decrease likelihood of
        // making the same sum by different summands. Substract `browser` in order
        // to decrease output value
        return Math.abs(offset * 17 + screenRes * 25 - browser);
    } catch (e) {
        return 1;
    }
}

Helper functions for https://gist.github.com/gabalafou/66f04297c0f03dee7d20