I'm not sure this add-on is working for me.

I press "Ctrl+D" and it automatically bookmarks into 'Other Bookmarks'.

No popups occurs for even the bookmark let alone the popup for saving into container.

edit:
Nevermind, it seems that this add-on works. However, the popup seems to be opening in a new window outside Firefox.

Very good.

But I do not need automatic popup when creating bookmark.
If the behavior can be disabled via configuration, it will be perfect for me.