Can't subscribe to web notifications
Hi, I can not subscribe to and receive web notifications from Twitter, Trakt.tv, Gmail, Outlook, etc. Twitter says: "Unsupported browser. It looks like your browser doesn’t support push notifications." and Trakt.tv just gives no reponse after the "connect" button is clicked. I can enable the settings in Gmail and Outlook but never get one notification.
I've tried tests like https://gauntface.github.io/simple-push-demo/, the result is: Ooops a Problem Occurred AbortError: Error retrieving push subscription.
Those web notifications work well in Chrome and Edge. System settings are ok as Firefox shows notifications from Snooze Tabs.
I'm using Firefox 83.0b6, tried Firefox 82.0.2 and Firefox Developer Edition on a MacBook Air 2017 with macOS Catalina 10.15.7.
Any help is appreciated. Thanks in advance!