The issue I have experienced has been that each time I click on the "resend" option for a confirmation link to verify my sync account, I get a drop-down pop-up that says Firefox can't send a verification at this time. I've restarted the program, restarted the computer and the program, etc. I have clicked on the option to resend the link for account verification aprox. 24 times over the last week to make sure the service wasn' just temporarily down for an update or something of the like. I am using Firefox 41.0.1. I will add screenshots when the popup for resending a confirmation link comes up.