Besides, Mozilla is not trying to tie down anyone to it's platform, because the platform is basically the Web, which is open to everyone. There are many things which distinguish it from other platforms like you can host your "apps", which are nothing more than simple websites, on your own site and not necessarily Mozilla's MarketPlace. Mozilla is working hard to reduce the memory footprint and make the apps responsive[1] and by the time it comes out, I think it's going to have a really good performance.
Besides, Mozilla is not trying to tie down anyone to it's platform, because the platform is basically the Web, which is open to everyone. There are many things which distinguish it from other platforms like you can host your "apps", which are nothing more than simple websites, on your own site and not necessarily Mozilla's MarketPlace. Mozilla is working hard to reduce the memory footprint and make the apps responsive[1] and by the time it comes out, I think it's going to have a really good performance.
[1] - https://bugzilla.mozilla.org/show_bug.cgi?id=797189