Hello, Make sure you are not in firefox private browsing mode. (Options/Preferences -> Privacy & Security Firefox will: "Use custom settings for history" remove checkmark: [ ] "Always use Private Browsing mode") It is advised to disable sync during troubleshooting. This can be caused by a problem with the places.sqlite and favicons.sqlite databases in the Firefox profile folder. use "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 a 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. 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 Answer credit : cor-el