I will be creating a Archive Box instance on my homelab (when I finally have time to set one up). Saving YouTube videos from playlists sounds like a great idea, and looks like one I will be getting started on.
Made me think about the idea of a “web museum”, but I guess we already have that with the Internet Archive/Wayback Machine. I don’t know if they accept donations of people’s content however, so that seems like a great rabbit hole to go down.
The Tweaks for YouTube extension sounds super cool! I do suffer from the same problem, however, where I experience most of my YouTube from my phone.