YouTube Center is a userscript designed to expand the functionality of YouTube. It includes the ability to download the video you're watching, auto selecting your preferred video quality and much more.
The github.io download site is down again and due to that none of the downloads on Greasy Fork and OpenUserJS work since they get the userscript from the github.io site.
The github.io download site is down again and due to that none of the downloads on Greasy Fork and OpenUserJS work since they get the userscript from the github.io site.