Using the Push Simple Demo at serviceworke.rs[0], set a delay long enough that you have time to kill Fennec before the notification arrives, then kill Fennec. The notification never arrives. [0]: https://serviceworke.rs/push-simple_demo.html

I think this might be bug 1306340, which was just WONTFIXed. Although, from bug 1306340, comment 4, it sounds like the worker will only be able to run in the background, which we restrict anyway. At that point, it probably makes sense to drop the message, instead of having it run down the quota for a worker that tried to do the right thing.

Um, I meant bug 1301558, comment 4.