Make Firefox save new bookmarks in the Bookmarks Menu (not Other Bookmarks)

This has been a popular topic of discussion on the Mozilla Support Forums:

Before Firefox quantum, when pressing Ctrl+D, the created bookmark was put in the bookmarks menu by default (unlike clicking the star bookmark button, which defaulted to unsorted bookmarks). After updating to quantum, the default location is "Other bookmarks" - the same as pressing the star button.

How do I restore the old behaviour?

Their moderators chimed in to say that there currently isn't a built-in way to restore the Ctrl+D functionality to its former state. However, they also suggested that you can restore the previous Ctrl+D capability with a relatively new add-on, Default Bookmark Folder:

Firefox built-in bookmarking:

This feature only affect bookmarks added through the built-in Firefox bookmark icon or shortcut (Ctrl+D), or through the context menu.

You can:

• Select where the new bookmarks will be added
• Choose to add the new bookmarks to the top or the bottom of the selected folder