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Can't login to mozilla support on PC running Windows 8.1, so that I can Sync

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I am able to login to Mozilla support using a Windows 7 PC, but not my new Windows 8.1 PC on which I am trying to set up Sync.

I am able to login to Mozilla support using a Windows 7 PC, but not my new Windows 8.1 PC on which I am trying to set up Sync.

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