BetterSearch 1.9 (Mac)

An extension for Firefox which enhances Google (all international flavours, too), MSN Search, Yahoo Search, A9, Answers.com (web results), AllTheWeb, Dogpile.com, del.icio.us and Simpy.com bookmarks by adding previews (thumbnails) and Amazon product images and info (type, price, rating for US/DE/UK/CA/FR products), a quick preview feature as well as "Open in New Window", "Site Info" and "Wayback Machine" links to the search results.