Added in 1.0, item filtering. Don't highlight what you don't want to pick up. Bye bye Rotten Flesh!
Drop Highligher adds an outline to item entities so you can see them more clearly. This is especially helpful when items might fall behind something, get carried away by water, or when the item matches the background too closely (I'm talking to you, SAND).
You can disable the highlights with the o key, but why would you want to.
Now supports 1.20.1 through 1.20.11