Unfortunately, a Firefox session with thousands of windows crashed for me. I been trying to restore it without success so far. I tried to restore it using the well-known method (from https://www.youtube.com/watch?v=ZBFpulV9yg4 ) of creating a backup to the session store-backups folder and copying a json file to the original folder, but every file I try to use in the backup eventually gives nothing but a clear tab. Where am I wrong?