In the case of mobile, the term is used differently, at least as far as I have seen. Native apps are often used to describe apps using the platforms own UI too

In the case of mobile, the term is used differently, at least as far as I have seen. Native apps are often used to describe apps using the platforms own UI toolkit, widgets and API libraries (that is, they look and feel like platform apps and they integrate into the platforms services/notifications/...) So for FirefoxOS, HTML apps could be considered "native" by this definition.