Persistent notifications should live as long as it should and disappear when it does from OS notification center. "live" here means it should remain in the DB so that it can respond to clicks.
Bug 1881044 Comment 0 Edit History
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Persistent notifications should live as long as it should and disappear when it does from OS notification center. "live" here means it should remain in the DB so that it can respond to clicks, and "disappear" means removal from DB with proper notificationclose events.