rem: this.prefBranch.clearUserPref(prefName); 
add: try { this.prefBranch.clearUserPref(prefName); } catch(ex) {  } this.delayedSave(); 
context: function pm_reset(prefName){    this.prefRecords[prefName].realValue = null;    this.prefBranch.clearUserPref(prefName);}
meta: 1567	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1567/c721c41c9ab744ce8d31136bb80512afadc602ec/pref-manager.js/buggy/js/lib/pref-manager.js