If you previously preferred browsing old.reddit for its compact and information dense web layout, you should know that this theme can be replicated for Lemmy using monkey scripts.
For more information on installing browser extensions to use scripts linked by this post, checkout:
Bless! I really like this layout, it’s great. Thanks for sharing.
I like it so much that I could consider including it as the default for the lemmy instance I am building.
Looks like the script author is asking for advise on how to provide it as a theme. Perhaps you might be able to help them with just that: