irvinm wrote:(2) After moving items into the "menu bar", can I hide the "menu bar" to move it into the "title bar" like in previous versions of FF.
** Hiding the menu toolbar simply hides the bar and does not move the items up to the title bar.
In Customize UI panel -> See bottom-left corner -> Uncheck the "Title Bar" to hide the old titlebar.
Once the old titlebar is hidden, Menubar will be the top most toolbar, so we can use it as the customizable titlebar.