Follow2 Lite

From Follow2:

The Follow2 Add-on for Firefox is a Site Update Notifier. It is very powerful tool that could handle your favorite sites and check for updates in real-time to notify you when updated information comes from the web-sites you choose. The Follow2 status bar contains simple buttons options dialog, and right-click menu that allow you to manage any of your favorite sites in your web-site list. Follow2 allows you to submit a site, and each time one of your favorite sites is updated, you will see the notification in the status bar which tells you the site was updated, you can click on the notification to view the new updated information.