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All session data lost after update to 61.0

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hfirefox
hfirefox
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Firefox lost all session data after an update to 61.0 and a subsequent system reboot. No browser windows have been closed before the reboot.

When I started Firefox again the "Restore previous session" option was greyed out and in the folder sessionstore-backups there were only two files "recovery.baklz4" and "recovery.jsonlz4". Both didn't contain any useful data.

Is this a known bug?

Can I still do something to restore the previous session?

Firefox lost all session data after an update to 61.0 and a subsequent system reboot. No browser windows have been closed before the reboot. When I started Firefox again the "Restore previous session" option was greyed out and in the folder sessionstore-backups there were only two files "recovery.baklz4" and "recovery.jsonlz4". Both didn't contain any useful data. Is this a known bug? Can I still do something to restore the previous session?