Works well. Only problem is that it causes the entire youtube page to refresh whenever you click on a tab with the sort by oldest button.

It took only a couple of seconds to sort 5 years of videos on a channel so I could see the oldest first (much quicker than scrolling through page after page, thank you!!!)

However when I went back to that page of videos after watching a video, it was flashing and unuseable, so I'd have to refresh it and sort the videos again.

Work-around: Right-click on a video and choose Open in a New Tab.