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why do I need to set up sync when I only use 1 computer. A warning showed up that says: Sync encountered an error while connecting: Unknown error. Please try again.

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When I started up my computer this morning, a warning popped up saying: ! Sync encountered an error while connecting: Unknown error. Please try again.

Why do I need to set up Sync on Firefox when I only use this one computer and do not even have a cell phone?

When I started up my computer this morning, a warning popped up saying: ! Sync encountered an error while connecting: Unknown error. Please try again. Why do I need to set up Sync on Firefox when I only use this one computer and do not even have a cell phone?

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You don't really need Sync for one computer and no other devices. Sync is inactive until the user sets it up.

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If you do not want to use Firefox Sync any more, you can deactivate it. See instructions here: How do I choose what information to sync on Firefox?