Re: [w3c/push-api] Propose enabling background sync from `pushsubscriptionchange` events (#240)

Firefox doesn't implement background sync yet, but you can follow [this bug](https://bugzilla.mozilla.org/show_bug.cgi?id=1217544) if you'd like. IIUC, step 6 in the [`SyncManager.register` algorithm](https://wicg.github.io/BackgroundSync/spec/#sync-manager-interface) means you can't register a background sync from either handler when the page isn't active. That restriction can be lifted, though, and a `push` event might be a good opportunity to show a notification and schedule a sync for a later time.

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