I am creating a firefox extension that should give a notification when the user hits specific sites. I do not want the same kind of notification that firefox gives for pop-ups. I don't want the user to have to go through the hassle of clicking the X in order to close the notification. Instead, I would like it to look like what happens when a normal firefox download is completed - a notification comes up, and automatically goes after a few seconds. On a mac, it looks like a growl notification, and I love the way it looks. Is there an easy way to implement this feature?