hi, resetting your account password will delete all data stored on the firefox sync servers - there is a warning displayed about this before this step is taken and there is no way to revert this unfortunately. the only key to decrypt this data is gone. how did you reset your pc - with windows' internal tools? if so and in case you still have a windows.old folder present on your hard-drive you may be able to restore some user data from before the reset (look in C:\Windows.old\Users\<your username>\AppData\Roaming\Mozilla\Firefox\Profiles): * https://www.howtogeek.com/130558/how-to-restore-your-files-from-the-windows.old-folder-after-upgrading/ * [[Recovering important data from an old profile]]