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Firefox wants to sync to another device, but my mobile is already synced to my home laptop

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My home laptop and mobile is already synced, but at work Firefox is asking to sync to another device. I don't have a 2nd device to sync to?

My home laptop and mobile is already synced, but at work Firefox is asking to sync to another device. I don't have a 2nd device to sync to?

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Sync is totally optional. Ignore whatever you're seeing about needing to use Sync.