--- a/mobile/android/base/BrowserApp.java
+++ b/mobile/android/base/BrowserApp.java
@@ -1321,20 +1321,24 @@ public class BrowserApp extends GeckoApp
                 if (mDynamicToolbar.isEnabled()) {
                     mDynamicToolbar.setVisible(visible, VisibilityTransition.IMMEDIATE);
                 }
             }
         });
     }
 
     private void updateSideBarState() {
+        if (NewTabletUI.isEnabled(this)) {
+            return;
+        }
+
         if (mMainLayoutAnimator != null)
             mMainLayoutAnimator.stop();
 
-        boolean isSideBar = !NewTabletUI.isEnabled(this) && (HardwareUtils.isTablet() && getOrientation() == Configuration.ORIENTATION_LANDSCAPE);
+        boolean isSideBar = (HardwareUtils.isTablet() && getOrientation() == Configuration.ORIENTATION_LANDSCAPE);
         final int sidebarWidth = getResources().getDimensionPixelSize(R.dimen.tabs_sidebar_width);
 
         ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) mTabsPanel.getLayoutParams();
         lp.width = (isSideBar ? sidebarWidth : ViewGroup.LayoutParams.MATCH_PARENT);
         mTabsPanel.requestLayout();
 
         final boolean sidebarIsShown = (isSideBar && mTabsPanel.isShown());
         final int mainLayoutScrollX = (sidebarIsShown ? -sidebarWidth : 0);