Today, we announced the availability of Firefox 3.0 Beta 4, the fourth beta of Firefox 3!

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Firefox 3 Beta 4 includes more than 900 enhancements from the previous beta, including drastic improvements to performance and memory usage, as well as fixes for stability, platform enhancements and user interface improvements. Many of these improvements were based on community feedback from the previous beta.

Now available for download: http://www.mozilla.com/en-US/firefox/all-beta.html