1. Preferences dialog has error and cannot be open. 2. On prefs.js file remove `GLib.idle_add(GLib.PRIORITY_DEFAULT_IDLE, () => {` and use realize instead: https://gjs.guide/extensions/upgrading/gnome-shell-40.html#get-prefs-window-and-resize-it

I can open the prefs dialog, so what's the error?

TypeError: GObject.ParamSpec.jsobject is not a function Stack trace: @/home/ice/.local/share/gnome-shell/extensions/shuzhi@tuberry/ui.js:94:39 @/home/ice/.local/share/gnome-shell/extensions/shuzhi@tuberry/prefs.js:12:12 _init@resource:///org/gnome/Shell/Extensions/js/extensionsService.js:206:33 OpenExtensionPrefsAsync/<@resource:///org/gnome/Shell/Extensions/js/extensionsService.js:122:28 asyncCallback@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:132:22 run@resource:///org/gnome/Shell/Extensions/js/dbusService.js:177:20 main@resource:///org/gnome/Shell/Extensions/js/main.js:19:13 run@resource:///org/gnome/gjs/modules/script/package.js:222:19 start@resource:///org/gnome/gjs/modules/script/package.js:206:8 @/usr/share/gnome-shell/org.gnome.Shell.Extensions:1:17 and Error: Type name Gjs_shuzhi_tuberry_UI_FileButton is already registered Stack trace: _init/GObject.Object._classInit@resource:///org/gnome/gjs/modules/core/overrides/GObject.js:451:27 _init/Gtk.Widget._classInit@resource:///org/gnome/gjs/modules/core/overrides/Gtk.js:92:32 registerClass@resource:///org/gnome/gjs/modules/core/overrides/GObject.js:95:22 @/home/ice/.local/share/gnome-shell/extensions/shuzhi@tuberry/ui.js:11:26 @/home/ice/.local/share/gnome-shell/extensions/shuzhi@tuberry/prefs.js:12:12 _init@resource:///org/gnome/Shell/Extensions/js/extensionsService.js:206:33 OpenExtensionPrefsAsync/<@resource:///org/gnome/Shell/Extensions/js/extensionsService.js:122:28 asyncCallback@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:132:22 run@resource:///org/gnome/Shell/Extensions/js/dbusService.js:177:20 main@resource:///org/gnome/Shell/Extensions/js/main.js:19:13 run@resource:///org/gnome/gjs/modules/script/package.js:222:19 start@resource:///org/gnome/gjs/modules/script/package.js:206:8 @/usr/share/gnome-shell/org.gnome.Shell.Extensions:1:17

1. `jsobject` is the new API in gjs 1.67.2, see https://gitlab.gnome.org/GNOME/gjs/-/blob/master/modules/core/overrides/GObject.js#L344 2. GTypeName is generally unique in the code, so there might be more than one extension instance running.

I don't know how to fix that because it's not reproducible for me with GNOME Shell 40.1 / gjs 1.68.0.

Changed to approved since the preferences dialog can be open on Fedora 34 beta. Please remove `GLib.PRIORITY_DEFAULT_IDLE` for the next version. It's racy. Change it to `realize` as we have it on the port guide.

Thanks, I know it's racy but should not hurt anything. I will change that in the next version.