User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:71.0) Gecko/20100101 Firefox/71.0

Steps to reproduce:

I completely disabled notifications in every way I could. I used the intended user interfaces to block them. Then I went into about:config and disabled every type of service worker I could find.

If I could figure it out, I'd delete chrome://global/content/alerts/alert.xul ...

Actual results:

And yet, extensions (two different ones so far, but it's going to be a thing I can tell) have popped up notifications over the movie I was watching .... "hi! I updated!!! look at me!! I updated!!! look at my news!!!!"

Expected results:

I don't care. I wish I could block their stupid news tabs too, but I've given up on that.

The notifications have to go though.

The old spam was porn popups. Those are blocked thank god. But now the extensions want me to look at their news. I don't want to look at their news. Please help me not look at their news.

(In reply to Paul Miller from comment #0)

And yet, extensions (two different ones so far, but it's going to be a thing I can tell) have popped up notifications over the movie I was watching .... "hi! I updated!!! look at me!! I updated!!! look at my news!!!!"

What were the extensions? To disable that type of message, open the Add-ons Manager, then click the ••• next to the extension and choose Options. If the extension doesn't have a setting to turn off those annoyances, you can replace it with another that provides similar functionality.

There's nothing in about:preferences or about:config to turn off those messages. I don't think there's a unified, universal method that extensions have to use, so a global off switch may not be feasible.

I'm working on integrating extensions notifications with the permission manager, so that about:preferences can be used to control notifications. The second patch in bug 1589693 would allow you to explicitly disable notifications.

I'll mark this as a dependency of bug 1589693; once that bug is fixed, I will ask you whether this feature works as desired.