Make sure toolbars like the "Bookmarks Toolbar" are visible. Open the Customize window and set what toolbars (Show/Hide Toolbars) and toolbar items to display.

• Right-click empty toolbar area -> Customize
• "3-bar" menu button -> Customize
• View -> Toolbars
  *you can tap the Alt key or press the F10 key to show the hidden Menu Bar temporarily

• check that "Bookmarks Toolbar Items" is on the Bookmarks Toolbar
• if "Bookmarks Toolbar Items" is not on the Bookmarks Toolbar then drag it back from the Customize palette to the Customize window to the Bookmarks Toolbar

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

The bookmark row is empty and "SHOWS ALWAYS" as stated. In customize, it already shows "bookmarks Toolbar Items".

The configuration hasn't changed since it worked (for years). Just an upgrade to v91 Firefox.

I moved a number of bookmarks from the menu folder (since it had a large number of bookmarks), but it didn't make a difference as suspected.

Are there bookmarks in the Bookmarks Toolbar folder if you check this in the sidebar (Command+B) ?

If you use Sync then best is to disconnect Sync temporarily during troubleshooting.

You can check for issues with the places.sqlite and favicons.sqlite databases in the Firefox profile folder.

• use the "Places Database" -> "Verify Integrity" button on the "Help -> More Troubleshooting Information" (about:support) page

If errors are reported with "Verify Integrity", close and restart Firefox or reboot and retry.

If "Verify Integrity" cannot repair places.sqlite, rename/remove all places.sqlite and favicons.sqlite files in the Firefox profile folder with Firefox closed. Firefox will rebuild places.sqlite and restore the bookmarks from the most recent JSON backup in the bookmarkbackups folder.

• keep a backup copy of places.sqlite in case a new places.sqlite database has to be created
• you lose the history when a new places.sqlite is created

You may have to restore an older bookmarks backup in the bookmarkbackups folder via the Bookmarks Manager (Library).

• Bookmarks -> Show All Bookmarks -> Import & Backup -> Restore
• https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them

See also:

• https://support.mozilla.org/en-US/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file
• https://support.mozilla.org/en-US/kb/fix-bookmarks-and-history-will-not-be-functional

You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> More Troubleshooting Information -> Profile Folder/Directory:
  Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder
• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

>Are there bookmarks in the Bookmarks Toolbar folder if you check this in the sidebar

I thought I stated this explicitly above. No issues finding the bookmarks menu folder via Bookmarks command. Access and use of bookmarks are normal from the menu folder or any other bookmarks folder for that matter. It just doesn't show in the menu row as per the attached graphic.

No obvious corruption...

Task: checkIntegrity + The places.sqlite database is sane + The favicons.sqlite database is sane > Task: invalidateCaches + The caches have been invalidated > Task: checkCoherence + The database is coherent > Task: expire + Database cleaned up > Task: originFrecencyStats + Recalculated origin frecency stats > Task: vacuum + Initial database size is 10240KiB + The database has been vacuumed + Final database size is 5120KiB > Task: stats + Places.sqlite size is 5120KiB + Favicons.sqlite size is 7104KiB + pragma_user_version is 57 + pragma_page_size is 4096 + pragma_cache_size is -2048 + pragma_journal_mode is wal + pragma_synchronous is 1 + History can store a maximum of 125428 unique pages + Table moz_bookmarks has 2411 records + Table moz_keywords has 1 records + Table sqlite_sequence has 1 records + Table moz_annos has 2000 records + Table moz_anno_attributes has 3 records + Table moz_items_annos has 0 records + Table moz_places has 8469 records + Table moz_historyvisits has 9557 records + Table moz_inputhistory has 11 records + Table sqlite_stat1 has 20 records + Table moz_hosts has 0 records + Table moz_bookmarks_deleted has 0 records + Table moz_meta has 9 records + Table moz_origins has 2695 records + Table moz_places_metadata has 0 records + Table moz_places_metadata_search_queries has 0 records + Index sqlite_autoindex_moz_keywords_1 + Index sqlite_autoindex_moz_anno_attributes_1 + Index sqlite_autoindex_moz_inputhistory_1 + Index sqlite_autoindex_moz_hosts_1 + Index sqlite_autoindex_moz_bookmarks_deleted_1 + Index sqlite_autoindex_moz_origins_1 + Index sqlite_autoindex_moz_places_metadata_search_queries_1 + Index moz_bookmarks_itemindex + Index moz_bookmarks_parentindex + Index moz_bookmarks_itemlastmodifiedindex + Index moz_places_hostindex + Index moz_places_visitcount + Index moz_places_frecencyindex + Index moz_historyvisits_placedateindex + Index moz_historyvisits_fromindex + Index moz_historyvisits_dateindex + Index moz_places_lastvisitdateindex + Index moz_places_url_hashindex + Index moz_annos_placeattributeindex + Index moz_items_annos_itemattributeindex + Index moz_bookmarks_guid_uniqueindex + Index moz_places_guid_uniqueindex + Index moz_keywords_placepostdata_uniqueindex + Index moz_bookmarks_dateaddedindex + Index moz_places_originidindex + Index moz_places_metadata_placecreated_uniqueindex > Task: _refreshUI

I've already restarted Firefox 2 times knowing that startup issues may resolve upon reset.

Once more with feeling.

Now the bookmarks menu items SHOW UP!

Third times a charm.

You only see bookmark on the Bookmarks Toolbar that are in the Bookmarks Toolbar folder.

• https://support.mozilla.org/en-US/kb/bookmarks-toolbar-display-favorite-websites

Bookmarks in the Bookmarks Menu folder won't show up there if that is what you expected.

Sorry for not being precise. You are correct. There is NO confusion which folder contains the bookmarks that show up in the row above the tabs. It may confuse some because the bookmark toolbar folder ALSO shows up under the bookmarks menu folder via the main desktop "BOOKMARKS" menu item. So you can access them via the toolbar row AND the BOOKMARKS command.