This is a problem with the design website, so we will forward this to the design backlog. Closing this.

This is a documentation issue. There are many similar documentation issues in this repo and even a documentation label. Are you moving all of them to the design backlog or just this one? If it's just this one... why?

Maybe you can add a query string to the link that can be read by the extension to connect the room?

e.g. https://www.netflix.com/watch/81506284?syncroomid=MyRoom

This way the host user can just send the link to their friends, and the friends can just open the link and activate the extension.