Let me explain it to you : modern browsers have WebRTC, which enables you to create P2P web pages. Personally I think it is has many real-world use, it will make the web a little less hacky and it will remove some loads on servers which is good. It is a good technology to have in the browser. Now, about Mozilla Hello : The code added to your browser is really really small. In fact it's not much more than address book and a visual signal that you have a conversation going on. All the great stuff is actually on Mozilla's website. They generate a new session for each conversation you start and you just need to go on the site and then you give the url to someone else and they can join the conversation on both Firefox and Chrome. I think that it is a move in the right direction, since they are just adding some sugar to leverage a great web technology that they helped to build and this makes a great showcase of the power of this new technology. I also like it because I trust Mozilla much more than say Hangout or Facebook Messenger. I know that all of my friends use either Chrome or Firefox so there is no barrier. No signup, no installation.