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Looks like “tree style tabs” extension on Firefox.
Alternatively you can try Floorp browser (fork of firefox) which includes this by default. It’s like a mixture of Vivaldi and Firefox, but mostly Firefox.
![[GNOME] Everforest](https://lemmy.ml/pictrs/image/0f744420-0d3e-4ece-a6e7-5f43f1e8da4a.jpeg){kind=link}
Looks like “tree style tabs” extension on Firefox.
Alternatively you can try Floorp browser (fork of firefox) which includes this by default. It’s like a mixture of Vivaldi and Firefox, but mostly Firefox.