@rec, take a look to this post Errors from browsers with ssl_session_tickets off (nginx)
I’ve been testing it and for Chrome the error is ERR_SSL_PROTOCOL_ERROR but for Firefox it is SSL_ERROR_RX_UNEXPECTED_NEW_SESSION_TICKET
So you should review your nginx conf.
Edit: Sorry, I didn’t notice @pfg replied already with the same info.
Good luck,
sahsanu