You can check for problems with the <b>places.sqlite</b> database (bookmarks and history) in the Firefox profile folder. *https://addons.mozilla.org/firefox/addon/places-maintenance/ See also: *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 If you use Sync to sync the bookmarks then best is to disconnect Sync while performing maintenance/repair efforts to files in the Firefox profile folder. You can try to restore the bookmarks from a recent compressed .jsonlz4 backup in the bookmarkbackups folder. The name of a JSON bookmarks backup file includes a total item count (folders and separators included) and an hash value to prevent saving the same backup more than once. *bookmarks-YYYY-MM-DD_<item count>_<hash>.jsonlz4. *https://support.mozilla.org/kb/restore-bookmarks-from-backup-or-move-them *http://kb.mozillazine.org/Backing_up_and_restoring_bookmarks_-_Firefox

Now that they are restored if I sync again will the same thing happen?