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How do I push new sync data or remove bad data on all my devices?
Every time I delete my browsing history or remove a bookmark from any of my synced devices, the other devices re-sync it right back again. How do I get *ALL* my devices to reflect new sync data, and to reflect deleted sync data? The old Sync offered me an option to replace all devices data with a new device's sync data. I can't find anything similar in the new sync.
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AFAICT, new Sync keeps sending in data but is highly unwilling to erase it (can't tell new from old). New Sync's data transfer operations are still hidden from user access, too: https://bugzilla.mozilla.org/show_bug.cgi?id=966530.
What this means is that you can do very little via the UI. Basically you'll have to do things manually for now; the fastest way to erase server-side data is to change your password: https://support.mozilla.org/en-US/questions/1069771.
I stopped using Sync because it is currently more hassle for me than it is worth. Might be a while before it's on par with the better solutions out there.