How to "open all in tabs" bookmarks including links in second level folders (maybe each in new window with tabs) It opens only first level links... thanks

I mean, if I go to the main menu, bookmarks->some folder (this "some folder" includes a 5 bookmarks and "some folder 1", "some folder 2" each with own bookmarks), click "open all in tabs", then it opens only 5 bookmarks, but I want it to open bookmarks from "some folder 1", "some folder 2" too at the same time! (maybe in new windows with tabs for each "some folder 1", "some folder 2") doesn't matter. Is there a way to do this? Maybe addons? extensions? Maybe you could add this in future versions... THanks. It would be great for me and my friends. (they also asked about this) Sergey Knyazyuk