The plugin works best on Chrome/Chromium browsers and using the NodeJs configuration
file:/// urls don't keep the permission for microphone access but https:// urls do. The NodeJs configuration by default serves the wiki at
https://127.0.0.1:8080 and Chrome/Chromium can grant permissions to microphone access permanently to this url
If you have questions how to set up a Wiki under NodeJs, please ask and we can help you here
Best wishes,
Simon