diff --git a/mobile/android/base/BaseGeckoInterface.java b/mobile/android/base/BaseGeckoInterface.java
index 52b4318a3179..976958d530a5 100644
--- a/mobile/android/base/BaseGeckoInterface.java
+++ b/mobile/android/base/BaseGeckoInterface.java
@@ -7,6 +7,7 @@ package org.mozilla.gecko;
 
 import org.mozilla.gecko.AppConstants.Versions;
 import org.mozilla.gecko.prompts.PromptService;
+import org.mozilla.gecko.util.ActivityUtils;
 import org.mozilla.gecko.util.HardwareUtils;
 import org.mozilla.gecko.util.ThreadUtils;
 
@@ -73,24 +74,7 @@ public class BaseGeckoInterface implements GeckoAppShell.GeckoInterface {
         ThreadUtils.postToUiThread(new Runnable() {
             @Override
             public void run() {
-                // Hide/show the system notification bar
-                Window window = getActivity().getWindow();
-
-                if (Versions.feature11Plus) {
-                    final int newVis;
-                    if (fullscreen) {
-                        newVis = View.SYSTEM_UI_FLAG_FULLSCREEN |
-                                 View.SYSTEM_UI_FLAG_LOW_PROFILE;
-                    } else {
-                        newVis = View.SYSTEM_UI_FLAG_VISIBLE;
-                    }
-
-                    window.getDecorView().setSystemUiVisibility(newVis);
-                } else {
-                    window.setFlags(fullscreen ?
-                                    WindowManager.LayoutParams.FLAG_FULLSCREEN : 0,
-                                    WindowManager.LayoutParams.FLAG_FULLSCREEN);
-                }
+                ActivityUtils.setFullScreen(getActivity(), fullscreen);
             }
         });
     }
diff --git a/mobile/android/base/GeckoApp.java b/mobile/android/base/GeckoApp.java
index 12aae6571b6b..220ae8c941b9 100644
--- a/mobile/android/base/GeckoApp.java
+++ b/mobile/android/base/GeckoApp.java
@@ -47,6 +47,7 @@ import org.mozilla.gecko.prompts.PromptService;
 import org.mozilla.gecko.updater.UpdateService;
 import org.mozilla.gecko.updater.UpdateServiceHelper;
 import org.mozilla.gecko.util.ActivityResultHandler;
+import org.mozilla.gecko.util.ActivityUtils;
 import org.mozilla.gecko.util.EventCallback;
 import org.mozilla.gecko.util.FileUtils;
 import org.mozilla.gecko.util.GeckoEventListener;
@@ -103,7 +104,6 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewStub;
 import android.view.Window;
-import android.view.WindowManager;
 import android.widget.AbsoluteLayout;
 import android.widget.FrameLayout;
 import android.widget.ListView;
@@ -1075,24 +1075,7 @@ public abstract class GeckoApp
         ThreadUtils.postToUiThread(new Runnable() {
             @Override
             public void run() {
-                // Hide/show the system notification bar
-                Window window = getWindow();
-
-                if (Versions.feature11Plus) {
-                    final int newVis;
-                    if (fullscreen) {
-                        newVis = View.SYSTEM_UI_FLAG_FULLSCREEN |
-                                 View.SYSTEM_UI_FLAG_LOW_PROFILE;
-                    } else {
-                        newVis = View.SYSTEM_UI_FLAG_VISIBLE;
-                    }
-
-                    window.getDecorView().setSystemUiVisibility(newVis);
-                } else {
-                    window.setFlags(fullscreen ?
-                                    WindowManager.LayoutParams.FLAG_FULLSCREEN : 0,
-                                    WindowManager.LayoutParams.FLAG_FULLSCREEN);
-                }
+                ActivityUtils.setFullScreen(GeckoApp.this, fullscreen);
             }
         });
     }
diff --git a/mobile/android/base/moz.build b/mobile/android/base/moz.build
index 36dbb387254c..c642e34a7750 100644
--- a/mobile/android/base/moz.build
+++ b/mobile/android/base/moz.build
@@ -47,6 +47,7 @@ gujar = add_java_jar('gecko-util')
 gujar.sources += [
     'util/ActivityResultHandler.java',
     'util/ActivityResultHandlerMap.java',
+    'util/ActivityUtils.java',
     'util/Clipboard.java',
     'util/EventCallback.java',
     'util/FileUtils.java',
diff --git a/mobile/android/base/util/ActivityUtils.java b/mobile/android/base/util/ActivityUtils.java
new file mode 100644
index 000000000000..2e68625ea74c
--- /dev/null
+++ b/mobile/android/base/util/ActivityUtils.java
@@ -0,0 +1,39 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.util;
+
+import android.app.Activity;
+import android.view.View;
+import android.view.Window;
+import android.view.WindowManager;
+
+import org.mozilla.gecko.AppConstants.Versions;
+
+public class ActivityUtils {
+    private ActivityUtils() {
+    }
+
+    public static void setFullScreen(Activity activity, boolean fullscreen) {
+        // Hide/show the system notification bar
+        Window window = activity.getWindow();
+
+        if (Versions.feature11Plus) {
+            final int newVis;
+            if (fullscreen) {
+                newVis = View.SYSTEM_UI_FLAG_FULLSCREEN |
+                         View.SYSTEM_UI_FLAG_LOW_PROFILE;
+            } else {
+                newVis = View.SYSTEM_UI_FLAG_VISIBLE;
+            }
+
+            window.getDecorView().setSystemUiVisibility(newVis);
+        } else {
+            window.setFlags(fullscreen ?
+                            WindowManager.LayoutParams.FLAG_FULLSCREEN : 0,
+                            WindowManager.LayoutParams.FLAG_FULLSCREEN);
+        }
+    }
+}