Hi! I was trying to use the extension, it shows up in themes, but the Theme Preferences option wouldn’t appear under view. My Aseprite version is 1.3-dev .
Viewing post in Theme Preferences for Aseprite comments
On further inspection none of my extensions are working, please disregard what I said before. I probably just imported them wrong. With this one and a couple of the others it also said “Error parsing JSON file: unexpected end of input” which lead to me opening the .aseprite-extension files with winrar and manually installing them.