All the buttons on the upper left are missing from Vanilla FF 'File,' 'Edit,' 'View,' 'History,' 'Bookmarks,' 'Help.' However, that's not the issue here, the normal (orange) TB button is missing in upper left hand corner.
I attached vanilla FF (v32.03) and TB (v3.6.5).
Thanks for the fast response and great work you do! :)
The orange "Tor Browser" button has been replaced with a "hamburger" menu (located on the right end of the browser's navigation toolbar). This is a change that Mozilla made for Firefox; we had no choice but to adopt this new user interface as well. Here is some more info that might help clarify: https://support.mozilla.org/en-US/questions/997275