Set permission of microphone in firefox for bbb

Set permission of microphone in firefox for BigBlueButton

If BigBlueButton refuses to activate the microphone saying "Check permission of your browser's setting" and you checked your browser's setting but it's still not working:
Click on the "lock" left of the URL (where you see SSL certificate information) and click on "clear cookies and site data". Try again to activate the microphone in BBB (the icon at the bottom of the page) and see nomore popup but activating microphone.