rem: rootShell.observerService.AddObserver(vfdFocusObserver, "vfd-focus"); 
add: rootShell.observerService.addObserver(vfdFocusObserver, "vfd-focus", false); 
context:   startup: function ()  {    // add a focus observer so that we can update our content depending on which    // document is at front    var rootShell = vxUtils.getRootShell();    if (rootShell && "observerService" in rootShell)      rootShell.observerService.AddObserver(vfdFocusObserver, "vfd-focus");       this.mBundle = document.getElementById("historyBundle");  }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/da7e1268bd1d056d9a1cf802e22f3313c5accb15/history.js/buggy/extensions/vixen/resources/content/history/history.js