Creating a notification system using a firefox extension

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 开发者_运维问答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?

Thanks

I think you want this type of notification.

I'm not sure how to implement "Download Complete" type one - but since entire FF AFAIK is implemented in XUL, probably it's doable.

I have found the following:

chrome://global/content/alerts/alert.xul F Window used for stuff like "download complete" that shows in lower right

Haowever, if you don't find a way to do that, why not implement banner-notifications, the way StackOverflow does? They are not obtrusive as far as site functionality, don't require extra work to get rid of (well, SO ones do but you can rig yours to automatically fade away after a time), and very visible/noticeable with the right styling.