Hacker News Reader

Reminder that Firefox is most easily customized through Firefox Color at https://color.firefox.com/

That simply allows you to create firefox themes. OP's changes are not possible with the firefox theme engine

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