$ flatpak run org.gnome.Extensions

(gnome-extensions-app:3): Gjs-CRITICAL **: 10:42:14.477: JS ERROR: Gio.DBusError: Error calling StartServiceByName for org.gnome.Shell.Extensions: Process org.gnome.Shell.Extensions exited with status 1
_injectToMethod/klass[method]@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:273:25
_makeProxyWrapper/<@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:250:17
vfunc_startup@resource:///org/gnome/Extensions/js/main.js:82:28
main@resource:///org/gnome/Extensions/js/main.js:592:23
run@resource:///org/gnome/gjs/modules/script/package.js:206:19
start@resource:///org/gnome/gjs/modules/script/package.js:190:8
@/app/share/gnome-extensions-app/org.gnome.Extensions:1:17


(gnome-extensions-app:3): Gjs-CRITICAL **: 10:42:14.477: JS ERROR: TypeError: this._shellProxy is undefined
vfunc_activate@resource:///org/gnome/Extensions/js/main.js:58:9
main@resource:///org/gnome/Extensions/js/main.js:592:23
run@resource:///org/gnome/gjs/modules/script/package.js:206:19
start@resource:///org/gnome/gjs/modules/script/package.js:190:8
@/app/share/gnome-extensions-app/org.gnome.Extensions:1:17