The following comes via MozillaZine:

Mozilla Firefox 3 Beta 4 has been released for testing. The fourth beta of the next major Firefox version offers over 900 bug fixes over Beta 3, including improvements in download manager, full page zoom, better integration with Vista, Mac OS X and Linux, and significant improvements in speed and memory usage.

A developer-focused list of new features is available at Mozilla Developer News, and you can go grab the download right now from the Firefox Beta Downloads page.

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