Extensions are a great way for you to add new features to Safari 5.0.1. Built by developers, Safari Extensions use the latest HTML5, CSS3, and JavaScript web technologies. And they’re digitally signed and sandboxed for improved security. You can install extensions with one click — no need to restart Safari.Extensions
In Safari extensions gallery you can find lots of amazing extensions which makes your browsing experience even better. Facebook Photo Zoom is a simple extension that integrates directly into Facebook. You can just hover over the preview photo( e.g. thumbnail photo on album) and it shows you the enlarged big image without navigating to another page.
Extensions for popular websites Facebook, Twitter,Amazon,eBay, Various social networking sites etc can be found on the gallery
article source:http://www.dot4pro.com/apple/apple-updates-safari-5-0.html