Exactly my thought, and I don't unbderstand it. WebRTC solutions work in all browsers (but IE). Like for example https://talky.io/ which is also open source: http://simplewebrtc.com/ I'm thinking about adding it to my personal website actually.

What WebRTC Node.js server library are you using? SimpleWebRTC SinglaServer or something else? Does it support ICE, etc?

I don't use it yet, just been thinking about it.

This does look cool, but when it says "HTML5" I definitely do not think "requires Flash".

Try the app in Chrome, which uses HTML5 audio. Flash is for other browsers with graceful fallback.

As Firefox and other browsers support and stabilize HTML5 audio a.k.a. WebRTC, this App will support it too.

HTML5 audio and WebRTC are not the same thing.

WebRTC stands for Real Time Communication, and is a protocol for allowing browser-to-browser traffic. HTML5 Audio is a spec for playing sound through the browser via <audio> tags, which is confusingly also distinct from the Web Audio API, which is a Javascript API for programmatic sound.

Firefox already supports both HTML 5 Audio, Web Audio and WebRTC. This app is just crappy.