Worthless. Spent 3 hours downloading vids from youtube that I missed over the past week, and every single one has a huge QR code inserted into it. There was probably a warning in the little pop up in the download window warning about this, but the warning takes up precious space and keeps the entire download options window from opening, so after clicking the window closed over 2 dozen times today I finally clicked the box that said "Don't show this again."

Now I'll never know for certain. Screw this addon. Worthless.