I would love to have access to a history of my sessions. I have lost many groupings of tabs and once gone, it is very time consuming or impossible to get back to where you were.
Opera 48 remembers your previous closed tabs and windows even after the browsers has been closed. Not exactly a history but it may help recovering tabs/windows after a crash.
It does not if there is a problem with the browser or the OS. Even when it does, you can only look back to the previous session, anything before is also lost.