rem: return (pref.value == 0 || pref.value == 1); 
add: return (pref.value == 1 || pref.value == 3); 
context:   readEnableImagesPref: function ()  {    var pref = document.getElementById("permissions.default.image");    var enableRestricted = document.getElementById("enableRestricted");        enableRestricted.disabled = pref.value == 2;    return (pref.value == 0 || pref.value == 1);  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/058dd8aa5b6dea62c96c953197d15f958726be31/content.js/buggy/browser/components/preferences/content.js