Mh, I just went into about:config and had a look:

there is a whole set called "app.normandy..." Is it that "shit", because without notifing or asking me there is "shit" like unique users ID set with it and pointing to some shitty Mozilla URL.

Will deactivate it and report back. Anyway: Blame on Mozilla for this crap!

hi, such notifications would not be something that mozilla would be sending out - please check in your firefox permission settings if you have given a website the permission to send you push notifications and revoke them if you haven't done so intentionally: Web Push notifications in Firefox

I guess this could be it. When granting Notification Permissions a ServiceWorker is installed, like an invisible background website.

Is there any way to see what ServiceWorkers are in FireFox - a gathered list like with saved passwords would be helpful?

Thanks

you can see/control active service workers by typing about:serviceworkers into the address bar.

Thanks again! That worked - and that list had youtube, ebay and reddit. Ahhhhh - I get nightmares thinking of them collecting some data of me by me accidently allowing this. Is there any way to complete deactivate the notification feature, so I do not get prompted everytime?

Thank you

Found it by myself: See for "Menu" -> Preferences -> Notifications -> Settings for Notifications -> block all new request to allow notifications.

The list there also has other websites listed: In my case one website did not installed any ServiceWorker but still was allowed for Notification, as listed in here.

Topic closed.

Ps.: Doing it by about:config dom.webnotifications.enabled set to false