E-ink screens like displaying high-contrast, static content. Most of them is monochrome. Basic e-ink mode is a cheap feature with:
I suppose it can he achieved by tuning already existing configuration options and merely requires exposing a friendly switch in settings. Maybe even an extension would suffice.
A full-fledged e-ink mode also adds:
To be honest, there are no mainstream browsers optimised for e-ink (as of 2025), while the market is growing (ebooks, phones, desktop displays).