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* Timestamped log files are written to a `sessionstore-logs` directory in the profile directory * Errors will always get written to disk, the logOnSuccess pref ensures all logs are saved even if no error has been captured * The prefs configure how much logging we do. We have more verbose logging by default in nightly/early-beta, and less (errors, warnings) in release. * Logging statements have been added to the early phases of session restore. We'll add more I'm sure as we troubleshoot specific bugs. Differential Revision: https://phabricator.services.mozilla.com/D208816