Mozilla Firefox is a fast, full-featured Web browser. Firefox includes pop-up blocking, tab-browsing, integrated Google search, simplified privacy controls, a streamlined browser window that shows you more of the page than any other browser and a number of additional features that work with you to help you get the most out of your time online.
What's new in this version:
Version 3.6.4 introduces the Out-of-Process Plug-in sandboxing feature, which prevents crashes to Adobe Flash, Microsoft Silverlight, and Apple Quicktime from taking down the entire browser. It also makes four critical security fixes.