Mozilla Firefox project (formerly Firebird, which was formerly Phoenix) is a redesign of Mozilla's browser component, written using the XUL user interface language and designed to be cross-platform. Mozilla Firefox is a small, fast and very easy to use browser that offers many advantages over other web browsers like a popup blocker, tabbed browsing, a smarter search, hassle free downloading, and improved privacy and security.

Features of Mozilla Firefox include:
- comprehensive popup controls to keep unwanted advertising off your desktop;
- a tab browsing mode that lets you open several pages in a single window, allowing you to load links in the background without leaving the page you're on;
- integrated search (powered by Google);
- industry leading accessibility with Find As You Type - find links and page text by simply typing;
- simplified privacy controls that let you cover your tracks more effectively;
- a streamlined browser window that lets you see more of the page than any other browser while at the same time being more configurable;
- a large variety of free downloadable extensions and themes that add specific functionality and visual changes to the browser.