title: In Firefox Quantum, how can I get rid of the tab bar, want Tree Style Tabs only
body: <p>I'm a long time user of the "Tree Style Tabs" add-on of Firefox.  As a matter of fact it is <em>the</em> reason why I use Firefox</p>
  
  <p>Firefox automatically upgraded to their new version, Firefox Quantum.  Now there's an annoying bar of tabs across the top which is redundant because the Tree Style Tabs also puts the tabs on the left.</p>
  
  <p>Is there a way I can disable tabs on the top bar?  If not, is there a way I can go back to an old version of Firefox and not have it update to Firefox Quantum?</p>