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Both Firefox Hello and appear.in use WebRTC which is a Javascript API provided by the browser for this sort of stuff. So appear.in does require browser support.

Firefox Hello also is a website, it's just running inside the browser. http://mxr.mozilla.org/mozilla-central/source/browser/compon...

Hello doesn't depend on Firefox, Mozilla have bigger name and better marketing techniques.

i mean it says:

> Hello is super easy to use and your friends and family don’t even need Firefox to join your conversation. As long as they have a compatible browser, they’re good to go.

as far as i've read this is basically appear.in but with some native buttons in firefox, and optional firefox account integration.