If you open a new window (Cmd+n) can you access menus and toolbars normally in that window?

I haven't used the Mac version, but if you have a view menu, try View > Toolbars > Navigation bar

If you already have the Navigation bar but some controls are missing, you can reset the bar using View > Toolbars > Customize and clicking the "Restore Default Set" button

Any luck?

Make sure that toolbars like the "Navigation Toolbar" and the "Bookmarks Toolbar" are visible: "View > Toolbars"

• Open the Customize window via "View > Toolbars > Customize"

• Check that the "Bookmarks Toolbar items" is on the Bookmarks Toolbar
• If the "Bookmarks Toolbar items" is not on the Bookmarks Toolbar then drag it back from the toolbar palette in 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 set up

• http://kb.mozillazine.org/Toolbar_customization
• https://support.mozilla.org/kb/Back+and+forward+or+other+toolbar+items+are+missing