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I think that the idea here could be sensational but I don't think that it supports multi-tab browsing. My observation was that if you browse with a single tab the tree makes sense but most people don't do that- rendering the tree useless. For us power surfers who have gazillions of open tabs forget it.
I am not exactly sure how to pull off multi-tab support but this one has the potential to become a 4 or 5 star winner.