If you're on Windows XP, the choice is clear.

Since the release of IE 9 is coming, but Microsoft will not support XP users in it, I think the choice is obvious.


^{Execution duration is measured in milliseconds. Less time means faster speed. Testing conducted Asa Dotzler on the Dell Studio XPS (with an Intel Core i7 processor running at 2.93 GHz and 2.96 gigabytes of RAM) under Windows XP SP3. Testing was done by SunSpider 0.9.1 - a tool for measuring javascript performance.}

Firefox 4 is 17 times faster than IE 8 in the SunSpider test, the most generous to IE among the most popular means of measuring javascript speeds. IE is doing even worse in the V8bench and Kraken tests.
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Firefox has hardware accelerated, piercingly fast JavaScript, the ability to experience a truly modern Web - for hundreds of millions of people using Windows XP. Download Firefox 4 .