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. It includes a popup blocker, tabbed browsing, a smarter search, hassle free downloading, and improved privacy and security.

Mozilla Firefox has the following other editions available: Mozilla Firefox for Windows, Mozilla Firefox for Linux, Mozilla Firefox for Mac OS X, Mozilla Firefox for Windows (Gran Paradiso) and Mozilla Firefox for Mac OS X (Gran Paradiso).