I am subscribed to a number of YouTube channels, and I found a need to be able to watch all of the videos in order for certain channels. This describes how to do it.

https://chrome.google.com/webstore/detail/iridium-for-youtube/gbjmgndncjkjfcnpfhgidhbgokofegbl?hl=en

https://www.palain.com/?page_id=372