Edit C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2de66b35.default\sessionCheckpoints.json
{"profile-after-change":true,"final-ui-startup":true,"sessionstore-windows-restored":true,"quit-application-granted":true,"quit-application":true,"profile-change-net-teardown":true,"sessionstore-final-state-write-complete":true,"profile-change-teardown":true,"profile-before-change":true}
Ms-Dos/Windows
Unix
Write backup
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