Sort By: Oldest v1.4.3
*END OF LIFE*
YouTube has added the official button back. I will keep this extension up for anyone who wants it. also can be used to sort through shorts.
This extension returns YouTube Sort by: Oldest functionality. learn more at https://github.com/Elements6007/ReturnYoutubeSort/
v1.3.0 adds new animation screen, it can be enabled and disabled in its settings. the default value is set to Enabled.