Look on your desktop. Do you see a folder called; '''Old Firefox?''' '''https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile''' '''https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles'''

Thank you, but no, there's no Old Firefox folder on my Desktop. And reading the links provided hasn't helped me find my old bookmarks, unfortunately.

Are there any compressed .jsonlz4 backups available if you check that in the Bookmarks Manager (Library)? *Bookmarks > Show All Bookmarks > Import & Backup > Restore You can check for problems with the <b>places.sqlite</b> database file (bookmarks, history) in the Firefox profile folder. *Places Maintenance: https://addons.mozilla.org/firefox/addon/places-maintenance/ If the Places Maintenance extension can't repair the places.sqlite database file then remove all places.sqlite file(s) in the Firefox profile folder to make Firefox rebuild the places.sqlite database file from the most recent JSON backup in the bookmarkbackups folder. *http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox *https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file ----- *https://support.mozilla.org/kb/restore-bookmarks-from-backup-or-move-them *http://kb.mozillazine.org/Backing_up_and_restoring_bookmarks_-_Firefox You can use this button to go to the current Firefox profile folder: *Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder) *http://kb.mozillazine.org/Profile_folder_-_Firefox