Just looking at the source and finding out it's JavaScript. Although I'm probably living in a cave and didn't use Linux often on the desktop since years, it is common practice now to write Gtk/Gnome apps in JS? I tought Vala was the cool language for that kind of apps...
> I tought Vala was the cool language for that kind of apps... I think you’re about ten years behind the trend.
For example bookworm, a GTK eBook viewer.