Microphone authorization issue

URL of experiment: structural_priming [PsychoPy]

Browser: Mozilla Firefox

Description of the problem:
When I first initialized the experiment in a pilot session, it worked fine, I could enable the use of microphone in a message box. However, from the second run, it gives this error right at the very beginning of the task (before the trials with the mic component):

I cannot enable the mic use at this point in the browser. If I move forward in the experiment, it gives the following error (so I guess it is late anyway to authorize mic use at this point):


Could someone suggest a workaround for this issue?

Thank you in advance,