what operating system do fire tablets have
Android, the Fire HDX FireOS 3.0 operating system is listed as being compatible with Android; FireOS 3 is forked from Android 4.2.2, (API level 17). In the Fire HD (3rd generation) and Fire HDX (2nd generation) tablets, Fire OS 4 is included that is forked from Android 4.4.2 (API level 19).