The idea of introducing Hello is really great and should be able to replace the old Google Talk which many people loved. However this very useful option will die if not available on Android and perhaps Windows. I realise that Mozilla probably have many other ideas to work on and it's often hard to chose priorities but this is a chance to compete with Google and Hangouts which a lot of people do not like. It's a chance to make Mozilla indispensable and to have a niche in a World otherwise full of options. :-)