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I cant sync my data because i changed my password and all my data is gone

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i reinstalled my windows and then installed Firefox and i didn't know my password when i tried to sign in my Firefox account and i clicked "forgot password" and changed it.now i don't have any of my passwords or bookmarks and ...

i reinstalled my windows and then installed Firefox and i didn't know my password when i tried to sign in my Firefox account and i clicked "forgot password" and changed it.now i don't have any of my passwords or bookmarks and ...

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Changing the password of the Sync account is not a good idea because that will remove all data stored on the Sync server, so I'm afraid that your personal data is lost unless you have a backup. Sometimes Windows creates a "C:\Windows.old" folder when you reinstall (repair) Windows.