Comment 37 for bug 1232454

Thanks for the suggestions. I'd like to point out, however, that automatically killing the notification windows affects any notification, including ones that might indicate completely unrelated issues. I suppose this could result in quite annoying effects when potentially important messages are dismissed through this. Therefore I would not even consider this approach a workaround for the actual problem.
There might be a way to kill specific notification windows only, but I don't think that this leads to a clean solution for the bug either.