Comment by Boriss

Actually, you can do this in Firefox 29! Click the Customize hamburger-button on the right and then click "Customize." Drag the search bar from the menu bar down to the tools page. Then drag "Bookmarks Toolbar" up next to the URL bar. It should display as your bookmarks, listed next to the URL bar. Here's how it looks on my machine: http://cl.ly/image/1M3N3L0h3v1s