Iceweasel is Firefox, rebranded by Debian project. It is a powerful, extensible web browser with support for modern web application technologies.
Firefox is a redesign of the Mozilla browser component, similar to Galeon, K-Meleon and Camino, but written using the XUL user interface language and designed to be lightweight and cross-platform.
This browser is based on the Firefox source-code, with minor modifications. Historically, this browser was previously known as Firebird and Phoenix.