It's backwards! Unlike webrtc, iroh doesn't work inside a browser. It's for the case where you have two native apps that need to talk to each other p2p.
Apologies I should have been more precise. What I meant was it doesn't work on the browser support in the way webrtc works on the browser. The point of webrtc on the browser is to establish a peer to peer connection.
For browser / webapps you want webrtc.