Appears that for some reason the setting that was made in X11 doesn't carryover to Wayland.
To correct, you need to go to KDE System Settings
Select Applications
Select Default Applications
File manager needs to be set as Dolphin
If file manager is already set as Dolphin, you need to select something else,
press apply, then switch it back to Dolphin and press apply.
This will correct the situation.
Keeping this ticket open until after Wayland becomes the default in KDE.
Description of problem: firefox-wayland not recognizing kde dolphin as file manager Default is set for Dolphin: gio mime inode/directory Default application for “inode/directory”: org.kde.dolphin.desktop Registered applications: org.kde.dolphin.desktop ranger.desktop easytag.desktop kfmclient_dir.desktop org.gnome.Nautilus.desktop org.gnome.baobab.desktop org.kde.gwenview.desktop org.kde.kid3.desktop qmmp-dir.desktop Recommended applications: org.kde.dolphin.desktop ranger.desktop easytag.desktop kfmclient_dir.desktop org.gnome.Nautilus.desktop org.gnome.baobab.desktop org.kde.gwenview.desktop org.kde.kid3.desktop qmmp-dir.desktop xdg-mime query default inode/directory org.kde.dolphin.desktop Works perfect when using Firefox, however when using Firefox-Wayland Nautilus is always used as file manager. rpm -qa | grep firefox firefox-82.0-5.fc33.x86_64 firefox-wayland-82.0-5.fc33.x86_64 rpm -qa | grep dolphin dolphin-20.08.1-1.fc33.x86_64 dolphin-libs-20.08.1-1.fc33.x86_64