Hi, what were the steps leading up to this problem? For example, you signed out of a Firefox Account and told Firefox to delete all the data? Or you were browsing profiles and deleted a profile? Unfortunately, those would usually bypass the Recycle Bin, so you would need to think about any backups you make or possibly a shadow copy created by Windows at some point. Please refer to the following post about tools to check shadow copies: https://support.mozilla.org/en-US/questions/1391342#answer-1537905