Mozilla Firefox is a fast, full-featured Web browser that makes browsing more efficient than ever before. Firefox includes pop-up blocking; a tab-browsing; integrated Google searching; simplified privacy controls that let you cover your tracks more effectively; 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.Version 2 features an updated theme and user interface, built-in phishing protection, enhanced search capabilities, improved tabbed browsing, and inline spell checking. The latest release fixes a critical security vulnerability.