Using the Push Clients Demo on serviceworke.rs, tap the "Send Notification" button and then navigate to another page. When the push notification arrives, tapping it should navigate back to the Push Clients Demo page, but instead does nothing. I'm fairly certain this worked a couple of weeks ago. : https://serviceworke.rs/push-clients_demo.html
Hmm, it looks like that demo uses `Client::focus`, which AFAIK we don't support on Android yet. If you close the tab, it'll call `openWindow` instead, but I don't think focusing an existing one will work.
That's not the same bug; currently even what worked before (eg having the service worker open a new tab if you have closed the tab before the notification arrives) is broken. From mozregression, the culprit appears to be bug 1304145.
...but it looks like Jim already fixed it with the changes he landed for bug 1305498.