I really liked Tree Style Tabs before the restrictions on extensions.
I do understand that they needed to discontinue them, because it was a roadblock for faster engine, but they felt less like a hack to provide that functionality.
I think mostly that it is not part of the UI. Functionality wise I think it is ok.
Basically:
- the original tabs are still displayed (I know there was some way to tinker with FF files to have them hidden, but now I can't find where I've seen it)
- when viewing bookmarks, the treestyle tab disappears (since it's using the same side bar), so then need to use F1 to get it back)
- the old version also had an option where the side bar shrunk, and expanded when you hovered mouse, saving some space.
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