The Bookmarks panel that you open via the "3-bar" Firefox menu button drop-down panel only shows the recent bookmarks and has a Manage Bookmarks button (Ctrl+Shift+O) to go to the Bookmarks Manager (Library). You can drag the Bookmarks Menu button that shows the bookmarks in a drop-down list and drag the Library button that gives access to recent bookmarks and history from the Customize palette to the Navigation Toolbar. The Bookmarks Menu button has a "View bookmarks sidebar" menu item. See "How do I add the Bookmarks Menu button to the toolbar?" *https://support.mozilla.org/en-US/kb/bookmarks-firefox *https://support.mozilla.org/en-US/kb/use-firefox-sidebar-access-bookmarks-history-synced You can also access the bookmarks via the Bookmarks menu. *you can tap the Alt key or press the F10 key to show the hidden Menu Bar temporarily