Metastream Remote by Samuel Maddock

Visit https://app.getmetastream.com to create a session to watch streaming media with friends. This addon allows Metastream to control video and audio for synchronizing in a session.

To watch movies and television on subscription websites, such as Netflix, everyone connected will need their own account.

Browser tabs on app.getmetastream.com will send messages to embedded websites for interacting with media. This includes setting playback state (play/pause), the current time, and information about the page's URL.

For auditing purposes, the source code of this extension is available at
https://github.com/samuelmaddock/metastream/tree/master/packages/metastream-remote-extension