loading on firefox to new think pad
I am trying to sign up to fire fox on my new think pad. I had fire fox on my old mac that is 12 years old and near end of life. I tried to create using my email address that resides on my old mac and setting up a new account with the password shown as high security password and then it asked for the code that was sent to my old mac with the email address that is the same that I'm trying to create on new think pad .I was able to get the code and when Ientered it a message appeared stating problem. I retrieved the code within3 minutes of it being sent . what do I need to do to get set up on my new think pad?