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Yeah the core of the pitch detection is in Flash, so that it can work in browsers that don't yet support HTML5 audio, such as Safari, and in older browsers. But where possible, we do grab the audio and do some of the signal processing using HTML5. Also, all of the UI is HTML5 and JS.

To be pedantic Flash is included in the HTML 5 spec via the object tag.

Flash is embedded into HTML via <object>, but that has nothing to do with the HTML5 spec. Flash is not part of the Web Platfrom or HTML5.

I've just been watching this IO talk on WebRTC, so it's certainly possible in Chrome and Firefox. https://www.youtube.com/watch?v=PMH1vM-dSc0

It actually does use WebRTC in Chrome. It falls back to Flash in FF right now.

Why? Firefox has had WebRTC support for a while.

Edit: Ok I see below you want Firefox to give you access to the users microphone without asking permission.