--- a/mobile/android/base/java/org/mozilla/gecko/BrowserApp.java
+++ b/mobile/android/base/java/org/mozilla/gecko/BrowserApp.java
@@ -1079,16 +1079,20 @@ public class BrowserApp extends GeckoApp
                 final boolean userReturnedToFullApp = !isApplicationInBackground();
 
                 // After returning from Picture-in-picture mode the video will still be playing
                 // in fullscreen. But now we have the status bar showing.
                 // Call setFullscreen(..) to hide it and offer the same fullscreen video experience
                 // that the user had before entering in Picture-in-picture mode.
                 if (userReturnedToFullApp) {
                     ActivityUtils.setFullScreen(this, true);
+                } else {
+                    // User closed the PIP mode.
+                    // Make sure that after restarting, the activity will match device's orientation.
+                    setRequestedOrientationForCurrentActivity(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
                 }
             }
         }
     }
 
     @Override
     public void onRestart() {
         super.onRestart();