Hi,
I have to say, yes, Coded UI tests do not support to work with FireFox in VS2012. If you find it is a very important feature for you, you can consider submitting one feature request on the Microsoft UserVoice site here:
http://visualstudio.uservoice.com/forums/121579-visual-studio
But it is supported in VS2010 if you also have VS2010 SP2 installed. For further information about it, see:
http://blogs.msdn.com/b/gautamg/archive/2010/11/15/support-for-silverlight-and-mozilla-firefox-in-coded-ui-test-and-mtm-is-out.aspx
http://msdn.microsoft.com/en-us/library/gg269475(VS.110).aspx
Thanks.
Vicky Song [MSFT]
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