Firefox not letting members join

Posted by shamus mcquail on Sep 24, 2016; 9:01pm
URL: https://support.nabble.com/Firefox-not-letting-members-join-tp7597354.html

So I had a member that was trying to join with firefox.  It kept telling him the security code answer was wrong.  He went to the edge browser and it worked first time.  Is this common?