Walter Mossberg prefers Firefox:
Meanwhile, other people have been building much better browsers, just as Microsoft itself did in the 1990s, when it challenged and eventually bested the then-dominant browser, Netscape Navigator. The most significant of these challengers is Firefox, a free product of an open-source organization called Mozilla, available for download at www.mozilla.org. Firefox is both more secure and more modern than IE, and it comes packed with user-friendly features the Microsoft browser can’t touch.
Firefox still has a tiny market share. But millions of people have downloaded it recently. I’ve been using it for months, and I recommended back in September that users switch to it from IE as a security measure. It’s available in nearly identical versions for Windows, the Apple Macintosh, and the Linux operating system.