gistfile1.js

function callbackWrap(object, property, callbackArgNum, wrapperMaker, extra) {
    var original = object[property];
    object[property] = function() {
        arguments[callbackArgNum] = wrapperMaker(arguments[callbackArgNum], extra);
        return original.apply(this, arguments);
    }
}

function reportExceptionsWrapperMaker(wrappedFunction, label) {
    return function() {
        var result;
        
        //console.log("START" + (label ? " ("+label+")" : ""));
        
        if (wrappedFunction && wrappedFunction.apply)
            result = wrappedFunction.apply(this, arguments);
            
        //console.log("END" + (label ? "   ("+label+")" : ""));
        
        return result;
    }
}

callbackWrap(window, "setTimeout", 0, reportExceptionsWrapperMaker, "window.setTimeout");
callbackWrap(window, "setInterval", 0, reportExceptionsWrapperMaker, "window.setInterval");
callbackWrap(window, "addEventListener", 1, reportExceptionsWrapperMaker, "window.addEventListener");
callbackWrap(Element.prototype, "addEventListener", 1, reportExceptionsWrapperMaker, "Element.addEventListener");
callbackWrap(Document.prototype, "addEventListener", 1, reportExceptionsWrapperMaker, "Document.addEventListener");