Sounds like when Firefox is open for too long. Probably just needs a patch to cycle itself when it starts to take up more resources than usual. I noticed in the below video that the UI seems to struggle to keep up with the controller inputs, often times freezing for 1-2 seconds.
http://www.ign.com/videos/2013/12/03/xbox-one-achievement-concerns-unlocked
I am the Playstation Avenger.
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