The article points out that while system colors are supported in Firefox (as of the time of the writing of the article), the "color-scheme: light dark" method h

The article points out that while system colors are supported in Firefox (as of the time of the writing of the article), the "color-scheme: light dark" method he was using was not supported, and it looks like that was not supported until Firefox 96 (January 2022).[0] [0] https://caniuse.com/mdn-css_properties_color-scheme https://caniuse.com/mdn-css_properties_color-scheme