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Unhappy with the flakiness of Google Contacts add-on, I thought I'd try this. It wiped out my entire contact list not just locally, but in my Google account. Thanks

Это отзыв для предыдущей версии этого дополнения (0.3.4). 

gContactSync will ask you for permission before deleting more than 5 contacts. If you're sure gContactSync did it I suggest you read dialogs more carefully in the future. Otherwise it's possible whatever else you are synchronizing your contacts with deleted them. Without more information I'm afraid I cannot help.

Google does have a very nice restoration feature inside Gmail if you view your contacts. gContactSync also makes backups but they aren't as easy to restore.