I consider myself a Firefox Power User. I have over 8000 bookmarks in hundreds of folders.
We need more tools for our Bookmarks Menus and Toolbars.
First on my Wish List would be Font options, so a bookmarks font could be Bold, Underlined, Colored, or All of the above.
Next would be a better way of editing. For example, being able to use a spreadsheet to edit our menus of Bookmarks to reorganize, sort, find duplicates, apply formatting, etc., using all of the tools a spreadsheet program offers.
The more options available to Browser Power Users for managing bookmarks, the more of them will switch to FireFox!!!