This is really frustrating. So I have been using ff sync for 20 years and have never seen anything like this. I sign into ff sync and it appears to work, but then my browser does not actually start syncing. I try again and again. Same thing. I even tried to sign in on my android phone. Same thing! It signs in to accounts.firefox.com just fine. Otherwise I 'd not be able to be logged into this forum... But my browser is not signing into sync. What the heck is going on?