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.

Changes:
- Inclusion of the FUEL Javascript library for extension developers
- New Page Info window
- Many Cocoa user interface improvements and bug fixes
- Basic Mac OS X crash reporting via Breakpad
- Improvements to offline application support
- Enabled Listing of Offline Resources and implemented SQL device for the offline cache
- Miscellaneous Gecko 1.9 bug fixes