diff --git a/mobile/android/base/gfx/Axis.java b/mobile/android/base/gfx/Axis.java
index cf7db8fe0c9..9dc59685de9 100644
--- a/mobile/android/base/gfx/Axis.java
+++ b/mobile/android/base/gfx/Axis.java
@@ -64,13 +64,12 @@ abstract class Axis {
     }
 
     static void initPrefs() {
-        JSONArray prefs = new JSONArray();
-        prefs.put(PREF_SCROLLING_FRICTION_FAST);
-        prefs.put(PREF_SCROLLING_FRICTION_SLOW);
-        prefs.put(PREF_SCROLLING_MAX_EVENT_ACCELERATION);
-        prefs.put(PREF_SCROLLING_OVERSCROLL_DECEL_RATE);
-        prefs.put(PREF_SCROLLING_OVERSCROLL_SNAP_LIMIT);
-        prefs.put(PREF_SCROLLING_MIN_SCROLLABLE_DISTANCE);
+        final String[] prefs = { PREF_SCROLLING_FRICTION_FAST,
+                                 PREF_SCROLLING_FRICTION_SLOW,
+                                 PREF_SCROLLING_MAX_EVENT_ACCELERATION,
+                                 PREF_SCROLLING_OVERSCROLL_DECEL_RATE,
+                                 PREF_SCROLLING_OVERSCROLL_SNAP_LIMIT,
+                                 PREF_SCROLLING_MIN_SCROLLABLE_DISTANCE };
 
         PrefsHelper.getPrefs(prefs, new PrefsHelper.PrefHandlerBase() {
             Map<String, Integer> mPrefs = new HashMap<String, Integer>();
diff --git a/mobile/android/base/gfx/DisplayPortCalculator.java b/mobile/android/base/gfx/DisplayPortCalculator.java
index debc6e48e66..442962da5e3 100644
--- a/mobile/android/base/gfx/DisplayPortCalculator.java
+++ b/mobile/android/base/gfx/DisplayPortCalculator.java
@@ -61,19 +61,18 @@ final class DisplayPortCalculator {
     }
 
     static void initPrefs() {
-        JSONArray prefs = new JSONArray();
-        prefs.put(PREF_DISPLAYPORT_STRATEGY);
-        prefs.put(PREF_DISPLAYPORT_FM_MULTIPLIER);
-        prefs.put(PREF_DISPLAYPORT_FM_DANGER_X);
-        prefs.put(PREF_DISPLAYPORT_FM_DANGER_Y);
-        prefs.put(PREF_DISPLAYPORT_VB_MULTIPLIER);
-        prefs.put(PREF_DISPLAYPORT_VB_VELOCITY_THRESHOLD);
-        prefs.put(PREF_DISPLAYPORT_VB_REVERSE_BUFFER);
-        prefs.put(PREF_DISPLAYPORT_VB_DANGER_X_BASE);
-        prefs.put(PREF_DISPLAYPORT_VB_DANGER_Y_BASE);
-        prefs.put(PREF_DISPLAYPORT_VB_DANGER_X_INCR);
-        prefs.put(PREF_DISPLAYPORT_VB_DANGER_Y_INCR);
-        prefs.put(PREF_DISPLAYPORT_PB_VELOCITY_THRESHOLD);
+        final String[] prefs = { PREF_DISPLAYPORT_STRATEGY,
+                                 PREF_DISPLAYPORT_FM_MULTIPLIER,
+                                 PREF_DISPLAYPORT_FM_DANGER_X,
+                                 PREF_DISPLAYPORT_FM_DANGER_Y,
+                                 PREF_DISPLAYPORT_VB_MULTIPLIER,
+                                 PREF_DISPLAYPORT_VB_VELOCITY_THRESHOLD,
+                                 PREF_DISPLAYPORT_VB_REVERSE_BUFFER,
+                                 PREF_DISPLAYPORT_VB_DANGER_X_BASE,
+                                 PREF_DISPLAYPORT_VB_DANGER_Y_BASE,
+                                 PREF_DISPLAYPORT_VB_DANGER_X_INCR,
+                                 PREF_DISPLAYPORT_VB_DANGER_Y_INCR,
+                                 PREF_DISPLAYPORT_PB_VELOCITY_THRESHOLD };
 
         PrefsHelper.getPrefs(prefs, new PrefsHelper.PrefHandlerBase() {
             private Map<String, Integer> mValues = new HashMap<String, Integer>();