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I don't know about socillion, but Tree Style Tabs is one of the reasons I won't stop using Firefox. https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...

Agreed, and I believe the Chromium guys have been asked for this feature and said they won't do it.

I don't think it is possible with chrome extensions either.

You can, however, get tabs in a sidebar, which works well for n <= 30 or so.

about:flags -> Enable Side Tabs