[citation][nom]gamerk316[/nom]This is why programmers like me want Metro to fail. Because of the new GUI, you are going to have two versions of most applications: One for the Metro UI, and one for older versions of windows. As a result, you have to maintain two seperate builds, which WILL lead to a lot more bugs in both.I pray Win8 falls flat on its face.[/citation]
Never heard of model-view-controller, then? At any rate, you could have said the same thing about command line apps versus windowed ones 20 years ago. Saying we shouldn't change anything because it could lead to more bugs is about the silliest thing you could say, especially as a programmer (I'm gonna go ahead and guess you're not a professional). EVERYTHING you do increases the risk of bugs when you're working on a project with more than a couple thousand lines of code.
As far as Firefox is concerned, they're using a new browser engine in the Metro version, which will likely make its way into the plain old classic version sooner rather than later. At that point, you only need to maintain separate view layers, which is pretty simple and has no chance of introducing extra bugs into the core of the browser beyond the initial change to the new engine.