The Windows Reset typically gives you options for whether/where to save your data. Typically that would be in a folder named: C:\Windows.old ''If you find that folder:'' Set Windows to show hidden files and folders -- this Microsoft article has the steps: https://support.microsoft.com/en-us/windows/view-hidden-files-and-folders-in-windows-97fbc472-c603-9d90-91d0-1166d1d9f4b5 Then explore that folder up to this point (if it exists): C:\Windows.old\Users\<username>\'''AppData\Roaming'''\Mozilla\Firefox\Profiles\ If you find recent data there, please pause and we can suggest how to resurrect your saved files.