Promises to remove duplicates, and mostly does so. Gave it 4/5 because some duplicates still show up.

This used to be a feature in RES, but it broke because of post IDs reaching 6-figure characters. This simple add-on promises to remove (hide) duplicates again, and it does so perfectly!

works great for me. I follow a lot of artists who repost their stuff across many subreddits and this does what it says on old reddit.