Conversation configured, but no microphone shown in web UI

Hello,

I tried to configure the “conversation” addon. To my understanding there should be a microphone displayed in the web page then which I press (in the browser) to talk to Homeassistant which then converts the speech to text. Unfortunately no microphone is shown in the web page. How can I get it?
I use version 0.84.1, as a manually installed package on a Raspberry Pi 1 B+.

My configuration looks like this and has been validated successfully and no complains in error log:

# Allows you to issue voice commands from the frontend in enabled browsers
conversation:
  intents:
    Light chain on:
      - [switch] light chain on
    Light chain off:
      - [switch] light chain off

Any help is very appreciated.
Thank you and Merry Christmas,
Anton

Conversation is not allow on IOS device.

If you use google chrome on computer. Got to settings>Advanced>Content Settings>Microphone>enable it.

Also the intents

Have you been able to solve this issue? I suppose it depends on the browser/OS you’re using.

In Chrome, the icon shows up, but not in Firefox. Unfortunately, I can’t find any documentation on this behaviour.

Can anyone give me a hint/link?

I get a microphone with Edge but not Firefox