window.addEventListener("load", function(e){

    let logger:function(t){
        let consolServ = Components.classes["@mozilla.org/consoleservice;1"].getService(Components.interfaces.nsIConsoleService);
        consolServ.logStringMessage(t);
    };

    let Xwin=this;

    gBrowser.addEventListener("DOMContentLoaded", function(e){
        let pageDoc = e.originalTarget;
        let pageWin = e.originalTarget.defaultView;
        let xulDoc = Xwin.document;



        if(pageDoc instanceof Xwin.HTMLDocument && !pageDoc.defaultView.frameElement){

           pageWin.setInterval(function(){logger(this);},500);  //prints [object XrayWrapper [object Window]] - which is what I want


           pageWin.timerClass=Cc["@mozilla.org/timer;1"].createInstance(Components.interfaces.nsITimer);

            pageWin.timerNotify={
                notify: function(timer) {
                    logger(this);   //prints [object Object] - which is the timer object, which is not what I want - how do I access pageWin from here?
                }
            }

            pageWin.timerClass.initWithCallback(pageWin.timerNotify,500, Components.interfaces.nsITimer.TYPE_REPEATING_SLACK);


        }
    },false);
}, false);