Two other notes:
1. The theme appears in the extension list as just "Halloween." It would be helpful if it was "Theme: Halloween" so that it sorted with all the other themes.
2. I also get the background repeating vertically. I don't know anything about themes and their requirements, but it would be nice if the background didn't repeat like this. I'm on a 5k2 monitor (5120 x 2160 resolution), using 2/3 of the width and the full height for my FGU window. Attaching a picture.
Attachment 54573