I haven't tried a Metro version but the latest FF in desktop mode doesn't have support for basic touch screen gestures, and doesn't support the stylus. Same with Chrome, but Chrome will outright freeze on pages that so far looks like some weird scroll configs (gmail after opening a few messages freezes)

IE 11 has at least basic gesture support, pinch-zoom, gravity scrolling (whatever its called). But what I really love is using the stylus, and IE treats that as mouse input, so you get hover, click, etc..