Amazon announces Fire OS 4 "Sangria" based on KitKat

Along with a bunch of new tablets, Amazon has also announced an updated version of its Fire OS for the tablets. Called Fire OS 4 (codename "Sangria"), the update is based on Android 4.4 KitKat and brings UI changes and a handful of new features. Amazon has tweaked the UI of the OS in version 4. There are now also profiles, so different users can have different email, Facebook, and Twitter, and