No Breeze theme in Firefox in Flatpak

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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?

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2

This seems to fix the issue:

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

4

I am not sure if this is still needed.

Also, following this thread, does anyone know what could cause Firefox to only display the close button but no the minimize and maximize buttons, when on KDE?

I am trying to debug a few bubblejail issues, which is a more customizable bubblewrap sandbox to run Firefox isolated, but with user namespace creation ability for sandboxing.