cooliris previewer

When you see this in operation, your first words will be "That’s Cool!" That’s what I muttered and then laughed when I looked at the name again

Cooliris will preview any website, image or video link and is customizable. Great for surfing ebay listings! Think of the possibilities. No steep learning curve either. To Preview a link, mouse over the link and then the Cooliris icon to get a fully functional smaller window with the page.

The best Firefox extension, or at the very least, one of the best. It is also available for IE, Safari, and Flock.