I'm running Firefox in 4 different machines and they are all in sync mode. The problem is, everytime I start Firefox on any of these machines, I receive an alert saying that my account name or password are incorrect and that Sync will try again automatically. Nothing happens, so i click the preferences button beside the message, update my password and Sync starts to work fine. How can I solve this? I've deleted my account 3 times and started new ones but I'm still having the same issue. Can anybody help me please?
I had the same problem with Firefox 20.0.1. I solved it when I saw that my Sync password saved in Firefox (Options -> Security -> Saved passwords -> Show passwords) was not the same as the one I entered when I set up Sync. Some special characters (like
é) were replaced by other characters.
So I solved the issue by changing my password and using only
a-z A-Z 0-9 characters.
(I filed a bug here)