I think there needs to have been an earlier failure to have caused this._storage to be null, but it's possible that got pushed out of the 250-item console buffer by other stuff. Any other exceptions immediately after restarting?
See also https://wiki.mozilla.org/Firefox:Password_Manager_Debugging, info from that would be helpful.
(But for the moment my magic 8ball suggests file/directory permissions.)
Status: NEW → RESOLVED
Last Resolved: 6 years ago
Resolution: --- → INCOMPLETE
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