Wejdź na stronę "about:support" i kliknij przycisk Sprawdź integralność w sekcji Baza danych „Places”. Powinien się wygenerować log, który możesz tu wkleić do analizy.

You can check that "Bookmarks Toolbar Items" is on the Bookmarks Toolbar

• if "Bookmarks Toolbar Items" is not on the Bookmarks Toolbar, drag it back from the Customize palette to the Customize page to the Bookmarks Toolbar

• if missing items are in the Customize palette, drag them back from the Customize page to the toolbar
• if you do not see an item on a toolbar and in the Customize palette, click Restore Defaults in the Customize palette window to restore the default toolbar set.

• https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars