Today I was accidently selected FF developer tools instead of firebug and found Firefox introduced 3D view!!!! and it look amazing.
It gives a clear picture of how elements are arranged. It’s quite amazing to be able to see BBC website for example and how they built it and maintain the layers.
Most exciting thing is not just to see a website structure in 3D but the prospect of having something view videos in a 3D mode and be able to browse it all in 3D and shift through layers as a user.
Youtube in 3D