add: delete client.currentObject.messageCount; 
context: function onDeleteCurrentView(){    var tb = getTabForObject(client.currentObject);    if (client.viewsArray.length < 2)    {        client.currentObject.display (getMsg("onDeleteCurrentViewMsg"), "ERROR");        return;    }        if (tb)    {        var i = deleteTab (tb);        if (i != -1)        {            delete client.currentObject.messages;            if (i >= client.viewsArray.length)                i = client.viewsArray.length - 1;                        setCurrentObject (client.viewsArray[i].source);        }            }    }
meta: 1567	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1567/050cdabf1fdd264ec70170f737d010f1e60b30e3/handlers.js/clean/xul/content/handlers.js