How do I install that? :)
Viewing post in Theme Preferences for Aseprite comments
You download the Aseprite extension file and open it with Aseprite. If you have the installed version of Aseprite it should automatically open files with the “.aseprite-extension” file extension. If you’re using a portable version of Aseprite you might need to open Aseprite first and then drag-and-drop the extension file onto the Aseprite window. ✌️