A set of a few hundred tabs, spread across a few windows, is like the bubbling organic head of a stream of temporal bookmarks. It would be great if there were some kind of time-based decay -- or ripening, depending on your perspective -- of open tabs into a more permanent bookmark-like arrangement, with spatial/proximity and window affinity cues. These could easily rehydrate to their live versions, or become fixed as "organic bookmarks" living alongside "affirmative" bookmarks and the normal, more ephemeral, uncurated browsing history.

Tree Style Tab for organization, Auto Tab Discard for the decay, Vimium-FF for search.

Thanks, I'll check those out.