New details on toolbar

Whether a toolbar is a final component or not -- more likely we'll have a set of buttons the user can choose to add, the toolbar is initially a way to provide easy hooks to our underlying datastructures.

Interestingly, the toolbar lives across all the tabs.  We might figure out a way to overlay the brower tabpanels such that we could get a local UI cache.
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Cantebury.nz Research

Andy Cockburn and rest of the folks in Canterbury have done lots of relevant work on page revisitation and enhanced history mechanisms.

There are a few pointers on the prior art page .  One notable idea is "implicit bookmarking" for pages visited multiple times.  This is a coarser notion than the hub detector.
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