--- a/mobile/android/base/java/org/mozilla/gecko/webapps/WebAppActivity.java
+++ b/mobile/android/base/java/org/mozilla/gecko/webapps/WebAppActivity.java
@@ -177,16 +177,39 @@ public class WebAppActivity extends AppC
 
         GeckoScreenOrientation.ScreenOrientation orientation =
             GeckoScreenOrientation.screenOrientationFromString(orientString);
         int activityOrientation = GeckoScreenOrientation.screenOrientationToAndroidOrientation(orientation);
 
         setRequestedOrientation(activityOrientation);
     }
 
+    private void updateDisplayMode(JSONObject manifest) {
+        String displayMode = manifest.optString("display");
+
+        GeckoViewSettings.DisplayMode mode;
+        switch (displayMode) {
+            case "standalone":
+                mode = GeckoViewSettings.DisplayMode.STANDALONE;
+                break;
+            case "fullscreen":
+                mode = GeckoViewSettings.DisplayMode.FULLSCREEN;
+                break;
+            case "minimal-ui":
+                mode = GeckoViewSettings.DisplayMode.MINIMAL_UI;
+                break;
+            case "browser":
+            default:
+                mode = GeckoViewSettings.DisplayMode.BROWSER;
+                break;
+        }
+
+        mGeckoView.getSettings().setInt(GeckoViewSettings.USE_DISPLAY_MODE, mode.value());
+    }
+
     private Integer readColorFromManifest(JSONObject manifest) {
         final String colorStr = manifest.optString("theme_color", null);
         if (colorStr != null) {
             return ColorUtil.parseStringColor(colorStr);
         }
         return null;
     }