Of course they're competitors (although the Mozilla party line is "competition is better for everyone"), but I think the takeaway here is the mutual respect the

Of course they're competitors (although the Mozilla party line is "competition is better for everyone"), but I think the takeaway here is the mutual respect they have for each other. Building a browser is hard. And building a good browser (which IE 10 is, by the way) is a major endeavor. So I think each team has a pretty good idea of the level of achievement that comes with finally shipping.