Unity 5.3.4 [lacks Microphone support in WebGL] and I don’t see it on the [roadmap]. In the meantime, a 3rd party WebGL workaround will need to be used. I of course need it for my [word detection] plugin. The forum references a couple cool plugins. 1) [pitch detection demo] and 2) [MicrophoneWebGL.unitypackage] which will need to be adapted to work. The Unity Web Player has been deprecated and appears to just work in Firefox as you can see with [Demo 1].