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Firefox 9 unofficially released

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Moz/FF

Ahead of an official release tomorrow, Firefox 9 has winged its way to various mirrors across the web and is now available to download from the official Firefox website — no messing around with a hammered Nightly FTP server this time, oh no!

The most significant change over Firefox 8 is the addition of type inference to the JavaScript engine, which singlehandedly improves JS execution speed by 20 to 30%. Without getting into the complexities of this change, type inference basically brings JavaScript one step closer to compiled languages (like C or C++) in terms of speed and optimization. For more information, see our type inference explainer.

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