Restore a bookmarks backup from before you deleted that folder. Instructions are here: https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them

hi johnlpowell, you can restore all your bookmarks to a prior date. press ctrl+shift+b in order to open the bookmarks library and then go to import & backup > restore... to select one of the automatic backups

If you have not closed Firefox since this happened, you could try the Undo function in the Library dialog. To open the dialog:

• Ctrl+Shift+b
• "Show All Bookmarks"

On the Organize menu, Undo will be enabled if it is possible to undo a recent change. Depending on the number of changes you made, you may need to use Undo several times. I'm not sure how deep the buffer goes, but I do know that it will be cleared when you exit Firefox.

Thank you so very much. Even though I had closed Firefox, I was still able to get the missing bookmarks back! I truly appreciate your help.