We introduced extended support in Coded UI Test for Cross Browser Testing with VS 2012 Update 2 February CTP (see this, this and this post for details). This post addresses details specific to managing browser profiles when using cross-browser testing feature.
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Coded UI Test enabled Cross Browser testing with Visual Studio Update 1. You can have a look at this link for some introduction on for cross browser testing. As part of Visual Studio Update 2, several enhancements were added to this feature. One of them,
I assume in this blog that you have basic knowledge of cross browser testing with Coded UI Test. You can visit this link which introduces cross browser testing with Coded UI Test , and also calls out the known limitations with this release.