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Can't remember why, but I ended up using Sidebery instead of Tree Style Tabs. So that's also a nice alternative.

I wasn’t aware of Sidebery, but it looks way better than TST. How is the performance? With TST I notice it doesn’t “hibernate” older tabs (only if you restart FF).

EDIT: Damn! I'm blown away by Sidebery. The amount of customization and native looks is awesome. There is only a slight problem when compared to TST: It does not preserve tab grouping when parent tab is closed.

There is another extension called Auto Tab Discard that integrates with TST. I'm going to check out Sidebery too though...TST is a little rough at times.

I switched from TST to Sideberry many months ago and have had no performance issues with quite a large number of tabs open.

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