Need to access the Firefox 3 Library function without clicking on Bookmarks, then Organize Bookmarks?  You could always go with the keyboard combination Ctrl+Shift+B.  Want an easier one? Try typing this in your address bar:
chrome://browser/content/places/places.xul

This will open up your Firefox 3 Library inside of your main browsing window.  Now you can have a little more screen real estate to edit and manage your favorite links.  Bookmark it and get this "big view" at your fingertips anytime you need it with [...]