Whenever I use FaceBook group calls, most of time I am not able to hear other FB users but they can hear me. This typically happens for the 2nd group call in login session. the way I am trying to resolve currently is log off, clear data and history in Firefox browser and then re-login and there is no problem. I do not know why this problem occurs only in Firefox, I do not see this issue in other browsers such as Chrome or Edge. can you please identify the cause and resolve it, it is very irritating. or let me know the solution for this issue.