This has been working for at least a year with `alert.useSystemBackend=true`, but not with `=false`. I guess this does not block but is blocked by bug 1497425.
Bug 1498623 Comment 4 Edit History
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This has been working for at least a year with `alert.useSystemBackend=true`, but not with `=false`. I guess this does not block but is blocked by bug 1497425. Try with: https://www.webpushnotifications.com/html5-browser-push-notifications-example-demo