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.
Latest Changes:
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Improvements to product stability
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Several security fixes
PS : You can also update from within FF : Help - check for updates.