[GeoNetwork-users] firebug causes undefined while searching geonetwork in firefox

Hi list, today we were discussing undefined messages occuring frequently while searching the geonetwork catalog in Firefox. The undefined messages occur frequently when searching the catalog, but also when displaying record-details.
It appeared the errors occured only when the firebug-window is closed. That made me uninstall Firebug. And magically no undefineds where displayed anymore.
So there apears to be a conflict between geonetwork and firebug. Since not many 'normal' users are using firebug, priority seems not that high. But if anybody has experience with this, please follow up...