add: throw("addPanelType: url is invalid!"); 
context:     addPanelType: function(url, title, parentPanel)    {        url = absoluteURL(url, this.window.location.href);        if (!url)        {            // XXXjoe Need some kind of notification to console that URL is invalid            return;        }        if (!this.panelTypes)        {            this.panelTypes = [];            this.panelTypeMap = {};        }        var name = createPanelName(url);        while (name in this.panelTypeMap)            name += "_";        var panelType = createPanelType(name, url, title, parentPanel);        this.panelTypes.push(panelType);        this.panelTypeMap[name] = panelType;        return panelType;    },
meta: 7450	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/7450/57be5cc0d05af01592ebc9354c9dd14cffcbf7de/tabContext.js/buggy/extension/content/firebug/tabContext.js