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Rated 5 out of 5 stars
i'm using v1.12 pre15. the "vertical tabs" feature works very well.
i just have one wish: make tabs move up and down by drag and drop instead of stacking them!
edit: now pre16. it seems to behave differently than before. its weird. i can only move a tab to the very top or to the bottom of all tabs.
Move your mouse near to the left or right end of the tab.