Southern writes:  

Author: Koroush Ghazi
Last Modified: September 2011

Introduction

Mozilla Firefox, or simply Firefox for short, is just a free Internet browser. It's not a cure for cancer. It doesn't wash your car or make you a frothy coffee. Why all the fuss and hype over Firefox? In a nutshell, the reason is simple: Firefox is a true open source competitor to Microsoft's Internet Explorer; a dynamic and evolving browser which is constantly gaining new features that make browsing the Internet easier, safer and more enjoyable. Most importantly, Firefox is the most customizable browser available today.

more: tweakguides