Can't Delete Bookmark in Mozilla Firefox

Issues :

• Can't delete bookmark from everywhere,
• Bookmark not showing in folder dropdown menu (in bookmark toolbar),
• Some Bookmarks doesn't have location info in bookmark manager

Solution :

1. Download Places Maintenance 1.3 Firefox Addons, Install it.
2. Go to addons>extension>places maintenance, option, >Preset : All>Execute
3. Restart Firefox
4. Solved

Source : https://support.mozilla.org/en-US/questions/958854