Full 5.
The worst are the jerks who show their dumb faces in thumbnails.
They usually have capitalised titles and are the verified. I'm not falling for their idiotic content and that extension is a true sanity saver.
Thank You.

By The Way, search for thetoptens most-annoying-youtubers blacklist, they forgot about Mark*plier, but there is most of trashmakers on the site ready to be blocked.