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Why has Firefox Sync stopped working?

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Over the past three days, I've been getting an error saying "Sync encountered an error while syncing: Unknown error. Sync will automatically retry this action." It retries, or I try it myself, and it fails. Nothing has changed on my system in the past few days. My upgrade to FF4 was weeks ago so that's not the problem.

Over the past three days, I've been getting an error saying "Sync encountered an error while syncing: Unknown error. Sync will automatically retry this action." It retries, or I try it myself, and it fails. Nothing has changed on my system in the past few days. My upgrade to FF4 was weeks ago so that's not the problem.