gistfile1.txt

function addXHRListener(callback)
{
    var open = XMLHttpRequest.prototype.open;

    XMLHttpRequest.prototype.open = function() 
    {
        this.addEventListener('load', callback.bind(null, this), false);
        open.apply(this, arguments);
    };
};

addXHRListener(function(xhr)
{
    if (/ajax-load-realtime/.test(xhr.responseURL))
    {
        var matches = /question" data-questionid="(\d+)/.exec(xhr.responseText);
        var post;
        
        if (matches === null)
        {
            matches = /answer" data-answerid="(\d+)/.exec(xhr.responseText);
            
            if (matches === null)
            {
                return;
            }
            
            post = document.querySelector('[data-answerid="' + matches[1] + '"]');
        }
        else
        {
            post = document.querySelector('[data-questionid="' + matches[1] + '"]');
        }
        
        if (post === null)
        {
            return;
        }
        
        // do stuff
    }
});