Two month ago, I use KDE neon with Wayland enabled. After set 'export MOZ_ENABLE_WAYLAND=1', Firefox hidpi work fine(200% scale factor, 4k monitor). However, as my hard disk damage, I have to install the latest KDE neon. But, firefox hidpi not working on Wayland protocol, ever I have set 'export MOZ_ENABLE_WAYLAND=1'.

Has it a way to fix this problem?