[Feature] Save New Bookmarks in Currently Open Folder

[OkyDooky]

Currently, it is a bit of a pain to save bookmarks by manually typing out part of the folder name each time (I know "Preview" offers a selector). It seems intuitive to go into a folder and expect it to offer that auto-filled in the "Folder" section of the dialogue box for saving a new bookmark. That way, I can simply navigate to the folder I want to save a new bookmark in and have it go right there. This is good if I'm doing research on a topic and want to save multiple bookmarks to that one folder, since it saves a step or two.