www.opera.com

Opera sucks sure there's an ebuild for opera but it just get dropped to /opt, it's statically linked, and it's CLOSED SOURCE, which means that it is a BINARY packag

Firefox doesn't share any significant code with the shitty Netscape Navigator 1.x~4.x . The browser engine (Gecko) is completely new, the JavaScript engine (SmileMonkey) is completely new, and the interface (Firefox) is completely new.