These appear to be correct settings, agreed. If we assume my code then does what it’s supposed to
Not something that is in the control of either extension and wouldn’t be a Firefox issue. If there is an issue, you would see it in the browser console, though it would likely be quite cryptic. Further, update scanner has a “fire and forget” approach for playing the notification sound when creating a notification.
The other three extensions that I know support it are three of mine:
- Live Stream Notifier (currently “barely” works, possibly with mixer)
- Advanced GitHub Notifications
- Netatmo CO₂ Indicator
That reminds me that I had at some point made a simple test extension to test the integration, I wonder if that’s still around somewhere.