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I like idea of tracks. However, calling this the browser of the future is a bit much. As far as I can tell, the only innovation is storing browser history in a tree rather than linear structure.
The title is obviously hyperbolic, I don't actually expect "Rainbow Lollipop" to become a threat to Firefox or Chrome any time soon, but it could perhaps be the next Opera - somewhat obscure, innovative, the browser of choice for power-users and hipsters.