I am trying to recover a FireFox session from a backup of my C:\ drive from a few months ago, but I am blocked by "access denied". No matter what I have tried, access is always denied. I an using FireFox version 149.0 on Windows 10, and am trying to manually make the substitution in the folder C:\Users\...profiles\318tzbcg.default-release\sessionstore-backups. I have tried the substitution with FireFox totally shut down (checked in Process Explorer) and even after a reboot. I am blocked from copying any of the current files to another folder or to rename them (as a precursor to (hopefully) replacing them), much less over-copying them with files from my drive backup. I have tried from an this with CMD (run as administer) in my normal user account (which has admin privileges anyway) and with an actual Administrator account. In my User account I have verified for the properties of the Profile and sessionstore-backups folders that all of the accesses are ticked as allowed for write and read (except Special Access is not ticked). The section with the tick boxes is greyed-out (with those boxes checked), and I cannot untick any of them or put a tick on Special Access. (I am writing this from a different machine, so have not clicked the Share Data button (troubleshooting information) on this submission form, but can provide that later from that machine,) What can I do to get the needed access (permissions) to substitute a recovered sessionstore.jsonlz4, recovery.json4lz or previous.json4lz file?