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I had the same problem last night.
In the middle of the night, my bookmark count went from 2300 to 30.
I have automatic sync turned on. No one was using the computer. It was password locked.
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I had automatic sync turned on so... "I" didn't do the sync that killed my bookmarks; but Firefox did.
Yes, I do have backups... thanks to EverSync. :-)
I was able to recover them, but it was very scary to see almost all my bookmarks gone.