CoolPreviews (formerly Cooliris Previews) eliminates your hassle of having to click back and forth between your searches and the results pages, and thus losing context of what you're searching for. With CoolPreviews, you can conveniently preview links on any Web site, including Craigslist, eBay, Google, and Google Images. You won't have to open every single page. Just mouse-over any link or image thumbnail and you'll be able to preview the underlying Web page or picture without clicking.
||Firefox 3.6 and later