In Wayland, global menu works only with KDE/QT apps in KDE Plasma.
There has been an effort by KDE dev to implement a protocol for it for all applications, but for lack of support by other compositor mainly (GNOME, hyperland, weston…) it has been stuck in review for 3+ years.
Janet even prepared patches for both firefox and chrome.
This is listed in Plasma/Wayland Known Significant Issues - KDE Community Wiki