There is another alternative which I use. Distraction Free (DF) Youtube. Works pretty well.

https://chrome.google.com/webstore/detail/df-tube-distractio...

https://addons.mozilla.org/en-US/firefox/addon/df-youtube/

There is another ad-on for youtube which I recently started using. It skips all the advertisement inside the video ( such as self promotion, product promotions, into/outro, sponsorships).

https://chrome.google.com/webstore/detail/sponsorblock-for-y...