Interesting article from InfoWorld defusing the myth that IE will ever go away. I read this as: Chrome and Firefox users tend to overlap, while IE entrenchment has its own base - so Chrome is more likely to displace Firefox than IE.
Meanwhile, Mozilla is trying to adapt, replacing FF's extension system (without which FF would have little advantage over Chrome) with a new framework called JetPack. This syntax example makes me think it's the wrong direction.