

sessionstore.js - created by Firefox 55 and earlier when it shuts down normally - rename to OLDsessionstore.js.sessionstore.jsonlz4 - created by Firefox 56 when it shuts down normally - rename to OLDsessionstore.jsonlz4.Check for any files with these names and:.Right-click the sessionstore-backups folder and rename it to OLDsessionstore-backups (later you can mine the files in this folder for any important tabs you want to restore).(If you see more than one, you'll want to figure out which one has the unwanted session history in it by checking each one.) You should see at least one semi-randomly-named profile folder there. Type or paste the following into the Windows Run dialog or the Windows 7 Start menu search box, and press Enter to launch Windows Explorer into this folder: To hide the session history files so Firefox has no choice but to start up fresh:


Hi, it's not the cache, it's the session history file.
