Four years ago today, Mozilla announced the release of Firefox 1.0. and delivered a better Web experience to millions of users. Top features included pop-up blocking, fraud protection, integrated search and tabbed browsing. What made you decide to give Firefox a try? And what were your favorite features in Firefox 1.0? 2.0? 3.0? If you’re interested in what’s coming next for Firefox, you can download and help test Firefox 3.1 beta 1.