Brief - feed reading extension for Firefox

Hi,
i'm developing extension (DblClicker) which handles clicks in the document. i'm using Brief and run into some problems...
calling preventDefault() , stopPropagation() does not prevent feedview from processing the click event.
what i could discover is that function FeedView_handleEvent(aEvent) doesn't check aEvent.getPreventDefault() and so i get double handling...
adding this check on the beginning of FeedView_handleEvent created some problem but putting it on FeedView__onClick worked for me.
 
could you check this issue?
       thanks
            yochay