Click on the Star still does that, but { Ctrl + D } was changed for Firefox 47 to save the new bookmark to the Bookmarks Menu folder all the way at the bottom of the listing.

^ No, you're wrong. In FF v47 click on the star produce same like Ctrl+D and that is shown in screenshot. In either of these two options I am forced to at least one click more.

I want that selected page (after one click) go directly to the unsorted bookmarks.

You can click the star twice to bookmark the current tab to the unsorted folder. The second click will close the doorhanger that opens automatically in the current Firefox 47 release.

^ Ok, I know that. But as I have already described I want something different. Any solutions or add-on proposal?

Ctrl+D will always save (and always has done this) the bookmark in the Bookmarks Menu folder. If you want to bookmark to the unsorted folder then you need to click the star.

See also:

• Add Bookmark Here 2: https://addons.mozilla.org/firefox/addon/add-bookmark-here-2/