Feature Request: Pinning Bookmark Folders with Cascading Menus in Sidebar

[aeghn]

Thank you for creating such an excellent plugin. In fact, it's one of the main reasons I use Firefox.

However, every time I open bookmarks, I still have to navigate through them step by step. So, I was wondering if it's possible to have a few bookmark folders pinned in the sidebar, with cascading pop-up menus (similar to the native Firefox way but horizontally displayed). This would make the browsing process much faster.