When using private browsing window, bookmarks toolbar keeps disappearing every time I open a new tab or anything else. My setting for show bookmarks is "always show" and it works normally in a regular window. It also used to work normally in private browsing until a few days ago. Clicking "show bookmarks toolbar" works until I open any of the bookmarks, then the toolbar disappears again. How do I make the toolbar permanently visible in a private browsing window?