No Breeze theme in Firefox in Flatpak

Ask Fedora
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1

I am using KDE in F39. Installed Firefox as flatpak. But firefox only use gtk theme. How do I apply Breeze theme in flatpak version of firefox?

2

This seems to fix the issue:

flatpak override --user --filesystem=xdg-config/gtk-3.0 org.mozilla.firefox
3

This is meant to work automatically. For posterity, are you using Wayland or X?

Also, is org.gtk.Gtk3theme.Breeze installed? If so, do you recall if you did that manually?