Go to the Update Scanner Addon Page and click the Add To Firefox button.
Adding a Page
Go to the web page that you wish to monitor for updates. Click the up-arrow icon in the toolbar and press the New button.
Editing Page Settings
You can choose how often the site will be checked for changes, and whether to ignore minor updates.
When an update is detected, you will see a notification panel. Click the notification to see the changes highlighted in yellow.
You can also see a list of updated pages by clicking the up-arrow toolbar icon.
To open the sidebar, click the up-arrow icon in the toolbar and press the Sidebar button. Updated items are shown in bold. Select an item in the sidebar to see the most recent changes.