You should search for the following files, if they are on the main disk , most likely you do support shadow copies of the file:
C:\Users\${USERNAME}\AppData\Roaming\Mozilla\Firefox\Profiles\${PROFILENAME}\sessionstore.[js,*]
You should search for the following files, if they are on the main disk , most likely you do support shadow copies of the file:
C:\Users\${USERNAME}\AppData\Roaming\Mozilla\Firefox\Profiles\${PROFILENAME}\sessionstore.[js,*]