Hi, where do you see that in Firefox? I think that might indicate that Firefox was installed from the Windows store instead of from Mozilla's website. The Windows store version uses very different folders than the regular installation, so simply uninstalling one and installing the other might result in some data loss. Have you set up Firefox Sync as a kind of "poor man's backup"? Of course, you also can save your data files more directly. Does this article work on the MSIX version: [[Back up and restore information in Firefox profiles]].