I don’t know, but FF, although having nice options for privacy, don’t set them by default, leaving the user to go investigate what to set and whatnot… And adds is a sensitive topic, though it’s understandable they want to make money…

That’s why I use instead Librewolf, which is pretty much FF with sane settings by default (actually I have to modify some not allowing me to use the browser under some scenarios), and removing binary blobs (FF still includes binary blobs). For Librewolf, the other nice thing is that it comes with uBlock-Origin by default, however it might be it’ll be harder for uBlock to actually block new ways of adds…