This document summarizes the history of web browsers and the development of Firefox. It discusses how Netscape Navigator was the dominant browser in the 1990s but lost share to Internet Explorer. The Mozilla Project was created in 1998 to develop a new browser based on Netscape code. Firefox was launched in 2004 and gained popularity due to its focus on open standards and customizability. Firefox is developed by volunteers including its core development team, daily contributors, and large community of testers and users.