Are the default theme colors outdated?

[vaxul]

I currently try to wrap my head around the colors.

The theme colors seems to doesn't match the current Firefox (v64) default themes.

I tried to use the CSS variables for theming a WebExt, but I haven't found any matching color f.e. for the toolbar.

Could anyone light me up, please?

EDIT: Can I found somewhere the source code of the current Firefox default themes?

Is there any available guide to matches the photon colors with the theme colors? F.e. like
--color-toolbar: var(--grey-10-a80);
(side node: grey-10-a80 doesn't match one hundred percent)

[vaxul]

Is nobody maintaining this repository?