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Firefox on new windows 10 computer won't sync with windows 7 computers

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RobertA13
RobertA13
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I installed Firefox on my new computer which I upgraded from Windows 8.1 to Windows 10. When I tried to sync it with my other computers running Windows 7 nothing happens. I am running Firefox ver.43 on all computers. I can't see anything wrong. Help?

I installed Firefox on my new computer which I upgraded from Windows 8.1 to Windows 10. When I tried to sync it with my other computers running Windows 7 nothing happens. I am running Firefox ver.43 on all computers. I can't see anything wrong. Help?