rem:  if (!element.parentNode) { return; } elementSetStyle(element, {"background-color" : element.originalColor}); 
add: try {  if (!element.parentNode) { return; } elementSetStyle(element, {"backgroundColor" : element.originalColor}); } catch (e) {} 
context:         window.setTimeout(function() {            //if element is orphan, probably page of it has already gone, so ignore            if (!element.parentNode) {                return;            }            elementSetStyle(element, {"background-color" : element.originalColor});        }, 200);
meta: 3175	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3175/b65b96860c14f050944e3fa047dbc1565d3db0a5/htmlutils.js/buggy/code/javascript/core/scripts/htmlutils.js