Firefox on Android sync returns "could not sign."

I have Firefox for Android beta v39 and Firefox for Android v38 installed on my phone (Lollipop 5.0.2) and little matter which of these browsers, I try, when I have connection for synchronization, it gives the message "Unable to connect"... I have installed on my linux desktop v38 and it works with the same credentials. I tried to reset the password, and it also does not help, because the problem is always the same... Desktop Sync works and it does not work on Android. Any suggestions?


I understand that Firefox for Android returns: "could not sign" I am happy to help you. Let's try a new connection by removing the account first.

  1. First unplug the account settings under 'Accounts' Android
  2. After listening to remove, open a new window in Firefox
  3. Go to
  4. Connect once more and make sure that in your account settings, that data usage is set to auto sync.

For troubleshooting, you have any content blockers or filters/proxies on your device?

Tags: Firefox App

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