Oh right, good catch. So the problem is that encrypted messaging on a webpage just can't be convenient like messaging on facebook if you want to keep the server

Oh right, good catch. So the problem is that encrypted messaging on a webpage just can't be convenient like messaging on facebook if you want to keep the server from having your messages. Other people send you messages, and you'll need to decrypt them yourself outside of the browser if you want to keep the browser from having your private key.