You only see the Bookmarks Menu button if the Menu bar with the Bookmarks menu is hidden (View > Toolbars or Firefox > Options).<br /> If the Bookmarks Toolbar is visible then the Bookmarks Menu button is displayed on the Bookmarks Toolbar as part of the Bookmarks Toolbar Items (bookmarks), but you can move it from the right side to the left side of the Bookmarks toolbar if the Customize window is open.<br /> Otherwise the Bookmarks Menu button will appear on the right side of the Navigation Toolbar.<br /> ---- Firefox 4+ versions have two bookmark buttons with a star in the Customize window.<br /> One star button has a drop marker that open a Bookmark menu.<br /> The other star button without the drop marker opens the bookmarks in the sidebar.<br /> You can drag the Bookmarks menu button with the drop marker in the Customize window from the toolbar palette on a toolbar (e.g. Navigation Toolbar or Tab Bar or to the left side of the Bookmarks Menu Items).