Hello, The issue is as follows: unless I use 'alerts.useSystemBackend = true' (which I don't want to do), I'm not getting any push notifications. Using this test site: https://www.bennish.net/web-notifications.html - the logs goes as follows: Notification #1 queued for display Notification #1 closed What I've tried: troubleshooting mode, reinstalling firefox, using a completely fresh&clean installation, and even reinstalling windows. Even after reinstalling windows and immediately installing firefox, the problem persists. However, it doesn't happen on another machine I've tested on, everything works perfectly there. What could possibly be the problem? Please help!