Global Chauvet by Global Chalet

GLCH Sync keeps everyone in a Global Chauvet watch-together room in sync while watching a video on a site Chauvet can't embed directly. Click the toolbar icon, enter your Chauvet room id, and press "Sync this tab" — play, pause, and seek there, and stay synced with everyone else doing the same. Requires an existing Chauvet room; it won't do much without one. It only ever sends the page URL you're syncing and basic playback state to your own Chauvet server — nothing else.