Fennec is not the core of FirefoxOS, no. Gecko is the core of both, but Fennec provides an Android UI. Fennec's requirements are more tied to what the underlyin

Fennec is not the core of FirefoxOS, no. Gecko is the core of both, but Fennec provides an Android UI. Fennec's requirements are more tied to what the underlying Android version supports. FirefoxOS is in fact working on requiring even less memory - there is a project underway to support devices with 128MiB: https://wiki.mozilla.org/FirefoxOS/Tarako https://wiki.mozilla.org/FirefoxOS/Tarako