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it will not open i have an account

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I am trying to sync desktop and phone - after I put in the codes and click I have an account it won't do anything(open) So I thought I would try advance setting but don't know where to get recovery key? Thank you for your help in advance

I am trying to sync desktop and phone - after I put in the codes and click I have an account it won't do anything(open) So I thought I would try advance setting but don't know where to get recovery key? Thank you for your help in advance

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See this for finding your Recovery Key on Desktop Firefox.
https://support.mozilla.com/en-US/kb/where-can-i-find-my-firefox-sync-key