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Unable to play Xfinity TV with Firefox browser

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Unable to play Xfinity TV with Firefox browser

I am unable to play Xfinity TV with my Firefox browser.  I always get a 422 Video Unavailable error.  However, I can play it fine using my Google Chrome browser.  I have the latest version of the Firefox browser installed on my computer.  I have cookies and Javascript enabled too.  I have the latest version of Adobe Flash Player installed on my computer.  I am using Windows Vista for my OS.  It just doesn't work.  When I had an older computer using Windows XP OS, then Firefox worked fine with Xfinity TV.  Now it does not.  How can I fix this?  HELP!

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