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you have more than something here Rated 5 out of 5 stars
Am am delighted by opening many tabs; sure not tabs for the sake of tabs. It is a surfing style and I plan on changing no time soon.
Tab Kit: can collaps into a set. You might like (borring some ideas from) it
TooManyTabs: can save a tab set into the TMT dimension (releasing resources)... but they seem to be resisting any kind of auto stuff anything into the TMT dimension with user rules. Maybe you could?
Bookmark current tab set: as you might imagine makes that process slightly easier.
1@ dev & folder nested: I like that, too
2@ dev: why not work to make tags nestable?