Wikipedia
Infobar
An infobar is a graphical control element used e.g. by the Internet Explorer, Firefox, Google Chrome and other programs to display non-critical information to a user. It usually appears as a temporary extension of an existing toolbar, and may contain buttons or icons to allow the user to react to the event described in the infobar.
An infobar is increasingly seen as preferable to dialog boxes because it does not interrupt the user's activities, but rather allows the user to read extra information in their own time.