rem: GroupBy(aPrefBranch.QueryInterface(Components.interfaces.nsIPrefBranch).getCharPref(aPrefName)); 
add: gHistoryGrouping = gPrefService.getCharPref("browser.history.grouping"); 
context:   observe: function(aPrefBranch, aTopic, aPrefName) {    try {      GroupBy(aPrefBranch.QueryInterface(Components.interfaces.nsIPrefBranch).getCharPref(aPrefName));    }    catch(ex) {    }  }
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/6217b4e655605e272563811dd65f5d17684d5ec6/history.js/clean/xpfe/components/history/resources/history.js