I run KDE Plasma, which has allowed the user to choose a custom accent color since Plasma 5.24. I was wondering if there was a way to pass through a GTK theme directory (like ~/.config/gtk-3.0 to a Snap like Firefox so that it attains the accent color like other GTK apps. This is possible to do on Flatpak via a flatpak override command or Flatseal, and it’s also worth noting that classic, unconfined Snaps like VS Code also use the host GTK theme.
If it is possible to do this, please let me know!