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Firefox account - missing authentication

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I'm trying to setup my Firefox account for sync but when I try and sign in I get a red box with 'missing authentication'. That's as far as I get...

I have verified my accout from the verification email initially sent.

I'm trying to setup my Firefox account for sync but when I try and sign in I get a red box with 'missing authentication'. That's as far as I get... I have verified my accout from the verification email initially sent.

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Try with your full email Id and Firefox SYNC password.

if not, try to signup

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Clear the cache and cookies only from websites that cause problems.

"Clear the Cache":

  • Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

  • Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"

Make sure that you allow cookies for the accounts.firefox.com domain if you aren't allowing cookies generally.

Can you login here: