I think you are on the right path: If you're making an app exclusively for Firefox OS, wrapping it in Cordova is not the path I would take.
However, if you're also planning on submitting it to the iOS app store, then making a Cordova app is useful.
Similarly, if you already have a Cordova app that you submitted to iOS and Android's stores, then you are now able to turn it also into a Firefox OS app fairly easily without having to fork your entire project.
However, if you're also planning on submitting it to the iOS app store, then making a Cordova app is useful.
Similarly, if you already have a Cordova app that you submitted to iOS and Android's stores, then you are now able to turn it also into a Firefox OS app fairly easily without having to fork your entire project.