Page Change Watcher от Belle

Page Change Watcher is a simple and powerful Firefox addon that monitors any web page for content changes. Whether you're tracking a sale, waiting for class announcements, or monitoring important updates, this tool will automatically alert you whenever the page content is modified. With just one click, you can start monitoring any site, and receive instant desktop notifications when changes are detected. Lightweight, easy to use, and perfect for keeping you informed without the need for constant refreshing!