It simply doesn't work on Youtube for me. Yes, I get a delay when first accessing the site, but then there's no delay when I click videos... it's not very useful.
edit: I noticed I should edit options and make it so it blocks all youtube pages, but it requires me to write a regex for it -_-
edit2: Please let me know when you publish the update, I'll update my rating as well :)

I don't see any settings to change the delay time. And the overlay should appear earlier.