SiteDelta is an Add-on for Mozilla Firefox 4 or higher.
SiteDelta can scan for changes to a website since your last visit. It adds a small Delta icon to your browser status bar. When you click onto it, it highlights all changed text contents of the current page (since the last time you clicked onto it). Clicking again cycles through the changes. Rightclick onto the icon provides access to other features offered by SiteDelta.
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We send you a screenshot of the changes as they appear ...