Invidious save video progressJS
Locally saves video progress on invidio.us and adds some more functonality such as: link to watch history, links to alternate invious instances, copying invidious links with timestamp, quick copy/open youtube link from list view.
Embedded YouTube Video Quality PreferenceJS
Set initial video quality for embedded YouTube videos based on a set of preferred video qualities, as well as minimum and maximum video qualities (configured in the script).
Youtube Old Video BlockerJS
Remove older Youtube videos from subscription feed, edit to customize threshold. It does not work on "loading more" videos (the script is not re-run when the page changes) - so just don't scroll down...