rien333 [1] filed a deletion request for whatsapp-nativefier-dark [2]: Superseded by aur/whatsapp-nativefier, which now has build-in dark mode support.
[1] https://aur.archlinux.org/account/rien333/ [2] https://aur.archlinux.org/pkgbase/whatsapp-nativefier-dark/
