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: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/aa842d85cbd5772fa8c33c0b8b1c070ddff69d69/content.js/clean/browser/components/preferences/content.js