@trytip, yes I have. This is the output of nheko without firejail:

(nheko:14154): Gtk-WARNING **: 16:06:46.060: Unable to locate theme engine in module_path: "adwaita",

(nheko:14154): Gtk-WARNING **: 16:06:46.060: Unable to locate theme engine in module_path: "adwaita",
qt5ct: using qt5ct plugin
qt5ct: D-Bus system tray: no
qt5ct: custom style sheet is disabled
[1]    14154 abort (core dumped)  nheko