I think you can actually do this without having a YouTube Red account - it's under youtube settings and then under playback (there's a checkbox for annotations)

I think you can actually do this without having a YouTube Red account - it's under youtube settings and then under playback (there's a checkbox for annotations). I'm using the Red free trial (it's 3 months) and it's actually pretty nice to have more control over the experience and not have to deal with ads. I found the ublock origin wasn't perfectly effective on YouTube anyway. If only FB offered a $10 a month no ad subscription it'd be a lot nicer to use too.