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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