Youtube ‘Watch Later’ functionality is broken on third-party sites
“The issue does not occur on Youtube itself - watch later buttons work fine there.
I see the issue when I click the 'Watch Later' button on embedded Youtube videos on other sites. Attached is a short GIF showing this happening on Kottke.org, and another GIF showing what happens when I reload the page without content blockers.
On the first one, it looks like it's trying to communicate with Youtube (some kind of authorisation popup appears briefly), but it fails to do so.”
Related to #530 (closed)