Synchronize various clients to some streaming services, such as YouTube or

First, make sure you and your buddies are at the same URL.

Open up the developer console. In Chrome, you can do this by pressing Control + Shift + J, or Command + Shift + J on Mac.

Copy the following code and paste it into the developer console. Note: Injecting a script like this isn't safe at all. Only do this if you 100% trust me. You can look at the script.


If everything worked correctly, a blue outline should appear around the screen. (If something went wrong, it'll be red.) Once you and your friends all join, press play. The video will play as fast as the slowest person, and everyone is guaranteed to stay within a few seconds of each other.