I hate when this happens, but thank you for checking all the important things.

Next step is to check for potential corruption in the database file that stores your bookmarks and history, and run some maintenance routines. Here's how you run the "Verify Integrity" diagnosis and repair function:

Open Firefox's Troubleshooting Information page using any of these methods:

• "3-bar" menu button > Help > More Troubleshooting Information
• (menu bar) Help > More Troubleshooting Information
• type or paste about:support in the address bar and press Enter

Near the bottom, there is a section titled Places Database -- that's the file which stores history and bookmarks. Click the button labeled Verify Integrity. There may be a 10-15 second delay before results appear.

If all is well, the report that appears below the button should start with:

> 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

Does yours say that, or something else? You can select and copy the report, and then paste it into a reply for review and comment.

That's what mine says at the top. Here's the full report:

> 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 20480KiB + The database has been vacuumed + Final database size is 15360KiB > Task: stats + Places.sqlite size is 15360KiB + Favicons.sqlite size is 13312KiB + pragma_user_version is 64 + pragma_page_size is 32768 + pragma_cache_size is -2048 + pragma_journal_mode is wal + pragma_synchronous is 1 + History can store a maximum of 126844 unique pages + Table moz_origins has 922 records + Table moz_places has 25868 records + Table moz_historyvisits has 41380 records + Table moz_inputhistory has 5 records + Table moz_bookmarks has 84 records + Table moz_bookmarks_deleted has 0 records + Table moz_keywords has 0 records + Table sqlite_sequence has 0 records + Table moz_anno_attributes has 3 records + Table moz_annos has 9 records + Table moz_items_annos has 0 records + Table moz_meta has 4 records + Table moz_places_metadata has 0 records + Table moz_places_metadata_search_queries has 0 records + Table moz_places_metadata_snapshots has 0 records + Table moz_places_metadata_snapshots_extra has 0 records + Table moz_places_metadata_snapshots_groups has 0 records + Table moz_places_metadata_groups_to_snapshots has 0 records + Table moz_session_metadata has 0 records + Table moz_session_to_places has 0 records + Table sqlite_stat1 has 17 records + Table moz_previews_tombstones has 0 records + Pages sequentiality: 56.7 + sqlite_schema: 32KiB (0.2%), 30% eff. + sqlite_autoindex_moz_origins_1: 32KiB (0.2%), 98% eff. + moz_inputhistory: 32KiB (0.2%), 0.5% eff. + sqlite_autoindex_moz_inputhistory_1: 32KiB (0.2%), 0.4% eff. + moz_bookmarks: 32KiB (0.2%), 15.8% eff. + moz_bookmarks_deleted: 32KiB (0.2%), 0% eff. + sqlite_autoindex_moz_bookmarks_deleted_1: 32KiB (0.2%), 0% eff. + moz_keywords: 32KiB (0.2%), 0% eff. + sqlite_autoindex_moz_keywords_1: 32KiB (0.2%), 0% eff. + sqlite_sequence: 32KiB (0.2%), 0% eff. + moz_anno_attributes: 32KiB (0.2%), 0.3% eff. + sqlite_autoindex_moz_anno_attributes_1: 32KiB (0.2%), 0.3% eff. + moz_annos: 32KiB (0.2%), 2.4% eff. + moz_items_annos: 32KiB (0.2%), 0% eff. + moz_meta: 32KiB (0.2%), 1% eff. + moz_places_metadata: 32KiB (0.2%), 0% eff. + moz_places_metadata_search_queries: 32KiB (0.2%), 0% eff. + sqlite_autoindex_moz_places_metadata_search_queries_1: 32KiB (0.2%), 0% eff. + moz_places_metadata_snapshots: 32KiB (0.2%), 0% eff. + moz_places_metadata_snapshots_extra: 32KiB (0.2%), 0% eff. + moz_places_metadata_snapshots_groups: 32KiB (0.2%), 0% eff. + moz_places_metadata_groups_to_snapshots: 32KiB (0.2%), 0% eff. + moz_session_metadata: 32KiB (0.2%), 0% eff. + sqlite_autoindex_moz_session_metadata_1: 32KiB (0.2%), 0% eff. + moz_session_to_places: 32KiB (0.2%), 0% eff. + sqlite_stat1: 32KiB (0.2%), 2.8% eff. + moz_previews_tombstones: 32KiB (0.2%), 0% eff. + moz_bookmarks_itemindex: 32KiB (0.2%), 2.5% eff. + moz_bookmarks_parentindex: 32KiB (0.2%), 2.5% eff. + moz_bookmarks_itemlastmodifiedindex: 32KiB (0.2%), 4.5% eff. + moz_bookmarks_dateaddedindex: 32KiB (0.2%), 3.9% eff. + moz_bookmarks_guid_uniqueindex: 32KiB (0.2%), 4.9% eff. + moz_keywords_placepostdata_uniqueindex: 32KiB (0.2%), 0% eff. + moz_annos_placeattributeindex: 32KiB (0.2%), 0.3% eff. + moz_items_annos_itemattributeindex: 32KiB (0.2%), 0% eff. + moz_places_metadata_placecreated_uniqueindex: 32KiB (0.2%), 0% eff. + moz_places_metadata_referrerindex: 32KiB (0.2%), 0% eff. + moz_places_metadata_snapshots_pinnedindex: 32KiB (0.2%), 0% eff. + moz_places_metadata_snapshots_extra_typeindex: 32KiB (0.2%), 0% eff. + moz_origins: 96KiB (0.6%), 35% eff. + moz_places_visitcount: 256KiB (1.7%), 79.6% eff. + moz_places_frecencyindex: 288KiB (1.9%), 78.8% eff. + moz_places_originidindex: 288KiB (1.9%), 80.2% eff. + moz_places_url_hashindex: 416KiB (2.7%), 85% eff. + moz_places_lastvisitdateindex: 448KiB (3%), 90.2% eff. + moz_historyvisits_fromindex: 448KiB (3%), 88.2% eff. + moz_places_guid_uniqueindex: 544KiB (3.6%), 92.9% eff. + moz_places_hostindex: 608KiB (4%), 93.1% eff. + moz_historyvisits_dateindex: 704KiB (4.6%), 93.1% eff. + moz_historyvisits_placedateindex: 832KiB (5.5%), 93% eff. + moz_historyvisits: 1024KiB (6.8%), 96.4% eff. + moz_places: 7968KiB (52.5%), 98.7% eff. > Task: _refreshUI

That sounds healthy.

This is frustrating because I haven't seen anyone identify what else could cause this issue besides

(1) "Bookmarks Toolbar Container" control not being on the bar, or (2) Database corruption

One user said the next morning reboot fixed it, which doesn't fit any known theory.

In other threads when Verify Integrity didn't restore normal, users were advised to remove the Places database file (places.sqlite) as a last resort as described in the following article: Fix "The bookmarks and history system will not be functional" error message. At your next Firefox startup, your history will be lost, but Firefox should use your last automatic bookmarks backup to start building a new Places database.

I have the same problem and have been unable to find a solution.

Hi Miniskier

Could you please start a new thread for your question?

Then you can provide more information like your operating system and installed add-ons.

• https://support.mozilla.org/en-US/questions/new
• https://support.mozilla.org/en-US/kb/use-troubleshooting-information-page-fix-firefox