I haven’t had this (I use dark themes quite extensively), but as I’ve said I’ve heard that experience may differ on different GPUs. I.e. it works better on some GPUs than on others.
You don’t need it, but you can try it.
Check this:
So Firefox on wayland still a bit experimental.
Also dnf info firefox-wayland says:
Description : The firefox-wayland package contains launcher and desktop file : to run Firefox natively on Wayland.
And dnf repoquery --list firefox-wayland:
/usr/bin/firefox-wayland
/usr/share/applications/firefox-wayland.desktop
So it’s just a launcher to run firefox you’ve already has installed natively on Wayland.
I’ve installed it and I now have two launchers: default one called “Firefox” and new one called “Firefox on Wayland”.
Just installed it, haven’t tried to run it).