When mozilla can not connect to any of my mail account it shows a message window - that's correct. When I work with e.g. Star Office I can see that window and sometimes mozilla changes the screen to mozilla screnn (if the message is connected with Browser) or to mail screen (in other case). That dosesn't happen every time but from time to time.
triple submission dupe of 76821 *** This bug has been marked as a duplicate of 76821 ***