I tried installing Stylish in GNU IceCat and that seems to work well, but have not yet found a way to install a Stylish global dark theme. It is unfortunately not possible for me to see the page content of https://userstyles.org on IceCat. Perhaps a workaround is to "Install from URLs..." (under IceCat's menu -> Add-ons -> User Styles), but I don't seem to have found the correct URL.

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