Bookmark menu
The book mark menu option (displaying the bookmark menu and allowing selection) has disappeared from the book mark tool bar and I can't find a way to add it back. Any suggestions?
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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
The checkbox for showing the Bookmarks Toolbar is a sub menu with three choices:
- "Always Show", "Only Show on New Tab", "Never Show"
"Only Show on New Tab" only applies to the "about:newtab" and "about:home" pages, so won't work when the new tab page is not set to the default Firefox Home screen.