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IIRC, it’s a button in the ··· menu.
Its not there for me
Ah, this only applies to regular inspectors. Since you’re using a tiling WM (I think), you could probably put it next to Firefox for something similar, right?
I’m on macOS
That is not possible. Browser toolbox runs in a completely separate Firefox instance in a separate profile so there’s no way you could display it inside the “main” browser window.