I love this extension! I have a bad habit of just letting the algorithm take me to the next video rather than getting off when I need to. I HIGHLY recommend this for TEACHERS because this will help keep students focused on the video.
My only gripe with this extension is that one time I removed it from my extension bar and was never able to get it back so I had to turn it off and on by turning off and on the whole extension in the add-ons menu.