Oh that's interesting. But the problem with relying on standards is what to do before people adopt them? (even the support for prefers-color-scheme is pretty ba

Oh that's interesting. But the problem with relying on standards is what to do before people adopt them? (even the support for prefers-color-scheme is pretty bad) I think any extension that adds better page theming needs to do its own CSS patching by default. If the project gets large enough and people want to fix their sites, they can do so through the web standards.