I don't know what's going on in Mozilla. Just today on my security camera NVR, Firefox pops up a dialog in the notification area at the lower right screen of Windows 11, showing an ad for its vertical tab feature, urging me to try it out. The thing is Firefox is rarely used on the NVR and the browser is not running. The only program running is the camera video app (the popup of course obscured the video window). It must be done by the background Firefox Update process. This is a brazen abuse of the notification area that even Microsoft hasn't tried yet.