After a recent Windows Update my Bookmarks Toolbar no longer automatically appears when I open a new window. How do I reset this?

Windows automatically updated my computer a few days ago and now when I open a Firefox window my Bookmarks Toolbar does not automatically appear at the top of the window. I can get it to appear there manually but I have to do it each time I open a window. Is there a way to reset it so that my Bookmarks Toolbar appears automatically at the top of the window every time I open a new window?