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How did you make firefox look like that, or is it anything else?
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.
That's a really pleasant colour palette. Don't mind me stealing that.
Which file manager?
What extensions/configs do you use for tabs managing? It seems like you have 2 columns for that.