Firefox won't re-sync after reimage

I was having problems with my phone an HTC One X) following the upgrade to Jelly Bean, and so I did a system reset this afternoon. When I reinstalled Firefox and paired it with my laptop, it claimed to have worked, but my bookmarks aren't here. I've tried removing the sync account from the phone and re-pairing. I've tried uninstalling and reinstalling Firefox. I've tried posturing with a different computer. Same result: it says it's synced, but no bookmarks. (They were there before the reimage.)

Any ideas?