I made a Chrome extension called Watchbear that lets you watch any video in sync with friends, and I finally got around to making a short video showing how it works. The idea is simple. You open a video, start a room, and share the code. Everyone who joins stays on the same frame. Play, pause, and seeking stay in sync for the whole room. There's also a side panel for chat and quick reactions, and it shows the current second of whatever is playing in the active tab. I built it mostly because ...