I never Bookmark things in FireFox, at least not by clicking the Bookmark icon. I use a Bookmarks toolbar and have folders setup such as Tech, Finance, Personal, etc... When I am on a website I want to bookmark, I simply click the tab (or the URL) and drag it to the folder on the Bookmarks toolbar that I want to save the Bookmark in and drop it. That way it's bookmarked and organized in one operation.