add: return false;   if (!PlacesUtils.nodeIsURI(aTipElement.node)) 
context:   fillInBTTooltip: function(aTipElement) {    // Fx2XP: Don't show tooltips for bookmarks under sub-folders    if (aTipElement.localName != "toolbarbutton")      return false;    var url = aTipElement.node.uri;    if (!url)       return false;    var tooltipUrl = document.getElementById("btUrlText");    tooltipUrl.value = url;    var title = aTipElement.label;    var tooltipTitle = document.getElementById("btTitleText");    if (title && title != url) {      tooltipTitle.hidden = false;      tooltipTitle.value = title;    }    else      tooltipTitle.hidden = true;    // show tooltip    return true;  }
meta: 10520	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10520/11802726db755aef069d721ae65f833ec449a3f1/browser-places.js/clean/browser/base/content/browser-places.js