I&#x27;m not sure, but I think that on Android resources are restricted in ways that give first priority to Dalvik vs other runtimes. I also suspect Chrome is given priority when it comes to integration with it.<p>There&#x27;s also something to be said about the advantages that default browser&#x27;s get in terms of market share.<p>Mozilla&#x27;s move to making their own OS might have come too late but the reasoning behind it was both strategically and technically sound.