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, such as the ability to block pop-up windows and the tabbed browsing.
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Download: Firefox 1.5.0.5 RC3 | 4.87MB (Freeware)
News source: Mozilla