Parameters

From nsIMicrosummary

 Add a microsummary observer to this microsummary.

 @param observer
        the microsummary observer to add
void addObserver(in nsIMicrosummaryObserver observer) 
 Remove a microsummary observer from this microsummary.

 @param observer
        the microsummary observer to remove
void removeObserver(in nsIMicrosummaryObserver observer)

From nsIMicrosummarySet

 Add a microsummary observer to this microsummary set.  Adding an observer
 to a set is the equivalent of adding it to each constituent microsummary.

 @param observer
        the microsummary observer to add
void addObserver(in nsIMicrosummaryObserver observer) 
 Remove a microsummary observer from this microsummary.

 @param observer
        the microsummary observer to remove
void removeObserver(in nsIMicrosummaryObserver observer)