This document discusses and compares several popular web browsers: Firefox, Safari, Internet Explorer, and Opera. It provides a brief history of each browser, describes their current state, and compares their strengths, weaknesses, competitors and threats. Firefox is highlighted for its speed, security, and tabbed browsing features, while issues with compatibility and memory are noted. Safari is praised for its speed and design but criticized for limited extensions. Internet Explorer is assessed as improving with regular updates but initially slower. Opera is highlighted for its torrent and content blocking capabilities.