Thanks, Artie. The best one was adsfreeyoutube.com. I'd never heard of it. I will probably use it from now on. Adblock, etc., doesn't work for Youtube ads. They used to, but I think YouTube (Google) found a way around it and now the ad blockers don't work on YouTube.
I don't want Chrome. But, in the end, I found adsfreeyoutube.com so thanks.
MacBook Pro - Sierra 10.12.6, Safari 12.1.2
iPhone 5s Version 9.3.2 iTunes 188.8.131.52