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Locate to the directory where firefox stores sessions: C:\Documents and Settings<Windows login/user name>\Application Data\Mozilla\Firefox\Profiles<profile folder>
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Rename sessionstore.jsonlz4
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Open sessionstore-backups
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Rename recovery.jsonlz4 and recovery.backlz4
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Copy the session files you need to the upper directory and rename it to sessionstore.jsonlz4
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Open firefox