rem: delete this.mViewerHash[aViewer.uid].viewer; 
add: delete this.mViewerHash[aViewer.uid]; 
context:   uncacheViewer: function(aViewer)  {     delete this.mViewerHash[aViewer.uid].viewer;  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/732dc6261a2ac11c9af2f33803020c5eb226df56/ViewerRegistry.js/clean/extensions/inspector/resources/content/ViewerRegistry.js