This Firefox add-on arranges tabs in a vertical rather than horizontal fashion. It is heavily inspired by and borrows ideas from the excellent Tree Style Tab add-on.
Note:This add-on is intentionally very minimalistic. It may feature support for grouping later (possibly using Panorama Tab Groups). But mainly the idea is to show tabs vertically.
The extension is no longer updated since March 2014 and it doesn't work on Firefox 57 and later.
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