In addition to rolling out guest profiles and a new profile switching mechanism, Google released a beta version of 64-bit Chrome for Mac. The new 64-bit build follows the stable release of 64-bit Chrome for Windows. Google says the 64-bit upgrade allows it to make a number of speed and security improvements to the OS X version of Chrome.
Unlike the Windows world that still includes a huge number of XP users on 32-bit machines, nearly every Mac user should be able to run 64-bit Chrome save first-generation Intel Macs.
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