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Really nice script. I've really been enjoying it!
So much that I've decided to make my own user scripts.
I have my first one published here:
Now your script removes my watched videos and my own script fills up my "Watch later" playlist.
Still working on the part to skip adding videos that are watched but that should be up in a few!
Great work, I'll put some links up in my project to recommend yours.
If YouTube doesn't comply to our needs, we'll do it ourselves!