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Sync on server corrupt

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While on a trip my laptop became corrupt, including Firefox. Firefox did a sync so I'm sure the copy on the servers is corrupt. When I get home and turn on my PC, how can I be sure Firefox with upload "a good sync" and not download the corrupt one and corrupt my PC. All themes, add-ons, etc. were deleted but bookmarks and bookmark toolbar seems OK.

While on a trip my laptop became corrupt, including Firefox. Firefox did a sync so I'm sure the copy on the servers is corrupt. When I get home and turn on my PC, how can I be sure Firefox with upload "a good sync" and not download the corrupt one and corrupt my PC. All themes, add-ons, etc. were deleted but bookmarks and bookmark toolbar seems OK.