Don't know anything about kit kat, I guess fires have their own OS. But the overdrive app works just fine for example on my fires with full screen. So its something they need to work on at Scribd I think. If other apps can do it I mean it should e possible for them too. I did send them a note through the contact system so I see if they respond.
I am still eyeing the Nexus, but I am not ready to pull the trigger. I would personally much prefer a Fire since I am pretty immersed in the Amazon system and I like how they look. I am probably one of the only folks that likes the carousel for example.
So I am still waffling over what to get. If there is a sale anytime soon on a Nexus, I could pull the trigger. I keep watching the price on it.
I am doing the same with the Fire HDX, but if I keep Scribd, I want to be able to read as comfortably as I can and with those menu bars is just really isn't.