Able to pin a bookmark in a section we can call pinned favbox

[tdm-x]

I know this one is not really mandatory but let me explain ;)

When we bookmark an url sometimes we want to keep this one in a special folder that is like our favorites items we want to have on our side all the times...

So it should be great if we can add a bookmark on the flow and choose to save it in a particular folder that we know its our "pinned" special folder or include the feature in Favbox to let itself manage this special folders with pinned bookmarks

In an other way Favbox could be able to show us the special folder (be ready to be selected) just beside the listbox in the popup screen before to save a bookmark.