Firefox 4 style interface in WPF?

The tab system in Firefox 4 is interesting, it is more like a streamlined ribbon than an average tab set...

Can this be done in WPF, and if not, does anyone here know what technology was used in the creation of this interface?

The reason I ask is that it does a fantastic job of being minimalistic, whilst still looking slick, and I think it would be nice to see this approach in other applications, as opposed to the ribbon interface which is popping up everywhere now.