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Tree Style Tab[0] automatically builds a tree of which tab opened which, and allows you to hide stuff based on that.

[0]: https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...

I use this add-on and it's great. My overall tab count has only risen a very small amount since I adopted this tool and I feel like I actually "work through" the open tabs in a more timely manner. It helps to see something like "(4)" to denote Child Tabs, and to know I have a bunch of Stuff waiting for me to sort through.

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