I built something similar that might work depending on your use case and doesn't require installing an extension. Check out https://tagx.io/ https://tagx.io/ H

I built something similar that might work depending on your use case and doesn't require installing an extension. Check out https://tagx.io/ https://tagx.io/ However, it doesn't overlay any annotations over the video like plopdown does (which is a great feature!), only on the side of the video.