In Firefox Mobile, when you add a new bookmark with the ⭐ button, you have to scroll through the entire list of folders where you are going to place the bookmark. It would be useful to have instead a search bar that filters only the folders that contain the search name. Also as additional information it would be useful to show for each search result, show the absolute path of the directory in order to understand where add the new bookmark. Example: root > child01 > child02...
👉Let me know in the comments what you think