add: var menulist = document.getElementById("defaultFont"); if (menulist.selectedIndex == -1) { menulist.insertItemAt(0, "", "", ""); menulist.selectedIndex = 0; } 
context:   init: function ()  {    this._pane = document.getElementById("paneContent");    this._rebuildFonts();  },
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/a219e2bd163daaa5122afbffb2175a5b6cc616f3/content.js/buggy/browser/components/preferences/content.js