I set up an "App shortcut" hotkey in macOS's System Preferences binding ⌘⇧N (command+shift+N) to "New Private Window", but it doesn't work - when I press the key combination, a new *non-private* browser window opens instead. In the first attached image, you can see the shortcut configured in the `Shortcuts` pane of macOS' System Preferences application. In the second image, you can see Firefox's `File` menu open, and verify that the shortcut is correctly assigned to "New Private Window", where it has replaced the default ⌘⇧P. However, as I said above, the custom key combination doesn't work - it seems to in fact trigger the regular "New Window", which is still the default ⌘N (command+N, no shift key). Any one know if this is a known issue, and if there are any solutions? Using a different key combination is not useful for me, since I'm trying to switch from Chrome and have ⌘⇧N very ingrained in my behavior (I pretty much always use private windows unless I need to log in to a site or explicitly want the history saved). If I can't have ⌘⇧N then I might as well just try to adjust to the default ⌘⇧P. The fact that executing the shortcut brings up a non-private window makes the whole thing much worse - I'm ending up using non-private windows when I think I'm using private ones :/