When you enable it, you will have your tabs from the previous session automatically restored when you launch Firefox. Similarly to Windows, Firefox offers a similar function. If there isn’t a tick in front of the ‘Restore Previous Folder Windows at Logon’ option, just check it and there you go! Select Folder Options and then click the View tab. To enable the automatic restoration of opened folders, open Windows Explorer (or any folder) and in its menu bar, go to the Tools menu. But if you don’t know (or don’t remember) where to enable it from, let me tell you. If you have messed with a lot with the settings in Windows, you’ve most likely already discovered these options. The ability to automatically restore opened Windows folders and Firefox tabs when Windows restarts is very convenient for people who have the habit of opening many folders and tabs.