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Cannot play Xfinity tv, DRM error

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I have Xfinity tv and since the FF update cannot watch. I get the same DRM error message. No problem in IE, but I prefer Firefox. I have play DRM checked in my options.

this is the error message:

(Error xacsa.xact.DrmRequest.exists: Exception calling flash method (DrmRequest) (Error: Error calling method on NPObject!))

I see others online with the same problem. Please fix this.