In the cogniscenti's esteemed opinions here, could any of the following be what's making groups.io say that my Firefox browser doesn't support notifications?
1. In my FF privacy settings, "Send websites a “Do Not Track” signal that you don’t want to be tracked" is set to "Always"
2. I always use private windows in Firefox, for some reason (when I open a new window, it automatically is a private window - for some reason, I can't easily figure out how to change this, but could figure it out if this could be the issue)
3. Block pop-up windows is enabled (actually I tried unchecking that but it had no effect, so this one is doubtful)
Messages are the sole opinion of the author, especially the fishy ones.