Sometimes toolbars or toolbar buttons are missing because they are hidden, you just need to bring them back up. Visit this article to learn how to bring them back: Customize Firefox controls, buttons and toolbars. You can learn tips and tricks at the same time.

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Use Toolbar Layout (Customize) to open the Customize window and set which toolbar items to display.

• Firefox menu button > Options > Toolbar Layout
• View > Toolbars > Customize

• check that "Bookmarks Toolbar items" is on the Bookmarks Toolbar
• if "Bookmarks Toolbar items" is not on the Bookmarks Toolbar then drag it back from the toolbar palette into the Customize window to the Bookmarks Toolbar

• if missing items are in the toolbar palette then drag them back from the Customize window on the toolbar
• if you do not see an item on a toolbar and in the toolbar palette then click the "Restore Default Set" button to restore the default toolbar setup

You can check for problems caused by a corrupted localstore.rdf file if the above didn't help.

• http://kb.mozillazine.org/Corrupt_localstore.rdf