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How to get Backup from Sync Server

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I deleted a user on my Laptop after this I created a new one. Then I started firefox and signed in in firefox sync but all my datas are lost. No tabs, no bookmarks and no addons were recovered, where can I get them back, when Firefox Sync don't save them?

I deleted a user on my Laptop after this I created a new one. Then I started firefox and signed in in firefox sync but all my datas are lost. No tabs, no bookmarks and no addons were recovered, where can I get them back, when Firefox Sync don't save them?

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Sorry, there are no backups for Sync data.

Per chance, did you request a new Password for your Firefox Account?

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If you need to scrounge up old data from your hard drive, you can try an "undelete" tool like the following:

https://www.piriform.com/recuva

The sooner you run it, the better, because every disk write destroys some old data.

As you may know, the folder you're looking for is your old profile folder. See: Profiles - Where Firefox stores your bookmarks, passwords and other user data.