Adaptative Tab Bar Colour compatibility

[khannurien]

Hi, thanks for the great theme!

It seems it is not compatible with the following extension: https://addons.mozilla.org/fr/firefox/addon/adaptive-tab-bar-colour/ When opened, the URL bar menu is transparent, making it hard to distinguish its content over the page content.

The extension author states that:

A CSS theme can work with ATBC, when system colour variables are being used.

They give a theme example that works with ATBC.

If you have time to look into it, that would be great, but I opened this big report mostly to track the issue.

Thanks again!