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It's handy but I've found no way to change the teal/cyan accent of the browser (or at least the color of links in the address bar)

There's no visible teal/cyan anywhere for me. These are my Firefox Color settings: https://color.firefox.com/?theme=XQAAAAJAAQAAAAAAAABBqYhm849...

I've hidden the tab bar, though, so there will likely still be an accent there.

The links in the address bar dropdown is teal/cyan for me: https://i.imgur.com/NfOavJ7.png