Mozilla's priorities are (and have mostly always been) for FF on Windows. It's a gripe that me (and the great majority of FF devs who use Macs and Linux boxes) have been suffering under for years) that those OSs will just never be the highest priority--and the reasons why have much to do with Apple and their Apple-first mentality for their platform. It is only partly a joke that the last users of Firefox will be software developers and their grandmothers. But there are a lot more grannies than devs.