Adopt automatic tree structure for vertical tabs

[WadeK]

The new vertical tabs arrangement is an excellent step forward but with the current presentation based on a simple "flat" list of tabs the available display space runs out pretty quickly. I'd love to see a management / presentation approach similar to that used in "Tree Style Tabs" extension.

[Jon]

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[brook9659]

I agree. I still have to use Tree Style Tabs (which works great). Hopefully the TST extension can be absorbed into Firefox as a native feature. It's one of the things which is unique to FF and makes FF so great.