While beta 3 showed off some of the initial native user interfaces for specific operating systems, in beta 4 Mozilla has made some extra changes to offer better integration with Windows, Mac and Linux. But perhaps the most noticeable enhancement user-side is performance, with the company claiming a two-fold improvement when running script-heavy web applications compared to Firefox 2. You can read more about the new beta in the official release notes, or grab the beta itself for Windows, Mac OS X and Linux.
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