Faster, more secure, easier to use and sporting a new look, this latest Firefox release sets a new standard for web browser innovation. 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 is small, fast and easy to use, and offers many advantages over other web browsers, such as the tabbed browsing and the ability to block pop-up windows.

When opening a new tab, users are now presented with their most visited pages.
The default home page now has quicker access to bookmarks, history, settings, and more.
SPDY protocol now enabled by default for faster browsing on supported sites.
Restored background tabs are not loaded by default for faster startup.
Smooth scrolling is now enabled by default.
72 total improvements to Page Inspector, HTML panel, Style Inspector, Scratchpad and Style Editor.
The column-fill CSS property has been implemented.
Experimental support for ECMAScript 6 Map and Set objects has been implemented.
Support for the CSS3 background-position property extended syntax has been added.
The :invalid pseudo-class can now be applied to the element.
The CSS turn <angle> unit is now supported.

|MG| Mozilla Firefox 13.0 Final Download