Sessionstore.jsonlz4 does not contain the current tabs, so where are they? After losing all of my tabs I copied the sessionstore-backups. They were quite large. Obviously they must contain my lost tabs. But now the current sessionstore.jsonlz4 has the ''very same '' large size. However, the lost tabs do not show up when Firefox is launched! And yet the few tabs – I’ve tried one, two, and three – that were open when Firefox is closed do show up. And the ''large size'' of each “new” sessionstore.jsonlz4 does ''not'' change at all! BTW I have tried inserting each one of the backups and nothing changes. The current tab or tabs shows up, but not the lost tabs. What is going on?