If you the user clicks a notification while fennec is not running, fennec will start but no notification click event will be sent to the service worker. Steps to reproduce: 1. register for push notifications on https://people.mozilla.org/~ewong2/push-notification-test/ 2. close fennec 3. send a push message via curl 4. click the notification Fennec will start and display the new tab page (or a previously opened web page). The service worker associated with the notification click doesn't start and no notification click event is dispatched.

Actually, step 2 should be taken after step 3. So: 1. register for push notifications on https://people.mozilla.org/~ewong2/push-notification-test/ 2. send a push message via curl 3. close fennec 4. click the notification

I've tested this again adding some debugging statements and I see the SW getting notification click events. Sorry for the noise.