Metastream is a website and companion browser plugin that provides support for synchronized viewing of streaming media with groups of friends. One user must act as a host, starting a Metastream session and then sharing a "friend code" with anyone they wish to invite. The host can then build a playlist by visiting streaming sites and adding the URLs of media they wish to watch to the play queue. For paid sites (such as Netflix and Hulu) all users joining the session must have an account that allows them to view the media. Optionally, hosts may allow other users in the session to add new media to the play queue. The Metastream browser extension is available for Firefox and Chromium-based browsers (including Google Chrome). An introductory video showing how to use Metastream and a set of troubleshooting instructions for common problems can be found in the FAQ section of the Github Wiki for Metastream.