Wäre ein Button möglich hier

//  Radio-Button fix 26

  (function() {


       if (location != 'chrome://browser/content/browser.xul') return;

       function buttonFunction() {
          oncommand: 'gBrowser.addTab("http://www.radio.de/").click();'
       };   


       try {
          CustomizableUI.createWidget({
             id: 'radio-de-button',
             type: 'custom',
             defaultArea: CustomizableUI.AREA_NAVBAR,
             onBuild: function(aDocument) {         
                var toolbaritem = aDocument.createElementNS('http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul', 'toolbarbutton');
                var props = {
                   id: 'radio-de-button',
                   class: 'toolbarbutton-1 chromeclass-toolbar-additional',
                   removable: true,
                   label: 'radio.de',
                   tooltiptext: 'Seite radio.de öffnen',
                   style: 'list-style-image: url(data:image/gif;base64,R0lGODlhEgASALMPAP//95v/GAIlCAQWBAQ1DMb/a97/rWveEFLWEJz/GAhrGAiUISG1If///wAAAP///yH5BAEAAA8ALAAAAAASABIAAAR18Mnpqp2YupN6KVUmOQzCJYWhGk5GlmcKzCy1MLBnzFb7WDnUztEotojGTUCILDYqTuMy0XRCjc8TslkhCASDAcJEjSYVizRufDhULQr0DVca90KOeHpO7/vyemp9dD4/cQoVe4qFI4eIDosiP4COIZIjdyIRADs=)',
                   oncommand: 'gBrowser.addTab("http://www.radio.de/").click();'
                };            
                for (var p in props)
                   toolbaritem.setAttribute(p, props[p]);            
                return toolbaritem;
             }      
          });
       } catch(e) { };
       }) ();