diff --git a/mobile/android/base/java/org/mozilla/gecko/ActionModeCompatView.java b/mobile/android/base/java/org/mozilla/gecko/ActionModeCompatView.java
index ad4311b9fc4e..c9021b7105d2 100644
--- a/mobile/android/base/java/org/mozilla/gecko/ActionModeCompatView.java
+++ b/mobile/android/base/java/org/mozilla/gecko/ActionModeCompatView.java
@@ -4,6 +4,9 @@
 
 package org.mozilla.gecko;
 
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Paint;
 import org.mozilla.gecko.animation.AnimationUtils;
 import org.mozilla.gecko.menu.GeckoMenu;
 import org.mozilla.gecko.widget.GeckoPopupMenu;
@@ -36,22 +39,20 @@ class ActionModeCompatView extends LinearLayout implements GeckoMenu.ActionItemB
 
     private int mActionButtonsWidth;
 
-    public ActionModeCompatView(Context context) {
-        super(context);
-        init(context);
-    }
+    private Paint mBottomDividerPaint;
+    private int mBottomDividerOffset;
 
     public ActionModeCompatView(Context context, AttributeSet attrs) {
         super(context, attrs);
-        init(context);
+        init(context, attrs, 0);
     }
 
     public ActionModeCompatView(Context context, AttributeSet attrs, int style) {
         super(context, attrs, style);
-        init(context);
+        init(context, attrs, style);
     }
 
-    public void init(Context context) {
+    public void init(final Context context, final AttributeSet attrs, final int defStyle) {
         LayoutInflater.from(context).inflate(R.layout.actionbar, this);
 
         mTitleView = (Button) findViewById(R.id.actionmode_title);
@@ -67,6 +68,15 @@ class ActionModeCompatView extends LinearLayout implements GeckoMenu.ActionItemB
                 openMenu();
             }
         });
+
+        // The built-in action bar uses colorAccent for the divider so we duplicate that here.
+        final TypedArray arr = context.obtainStyledAttributes(attrs, new int[] { R.attr.colorAccent }, defStyle, 0);
+        final int bottomDividerColor = arr.getColor(0, 0);
+        arr.recycle();
+
+        mBottomDividerPaint = new Paint();
+        mBottomDividerPaint.setColor(bottomDividerColor);
+        mBottomDividerOffset = getResources().getDimensionPixelSize(R.dimen.action_bar_divider_height);
     }
 
     public void initForMode(final ActionModeCompat mode) {
@@ -178,4 +188,15 @@ class ActionModeCompatView extends LinearLayout implements GeckoMenu.ActionItemB
             mMenuButton.startAnimation(s);
         }
     }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+
+        // Draw the divider at the bottom of the screen. We could do this with a layer-list
+        // but then we'd have overdraw (http://stackoverflow.com/a/13509472).
+        final int bottom = getHeight();
+        final int top = bottom - mBottomDividerOffset;
+        canvas.drawRect(0, top, getWidth(), bottom, mBottomDividerPaint);
+    }
 }
diff --git a/mobile/android/base/resources/layout/gecko_app.xml b/mobile/android/base/resources/layout/gecko_app.xml
index 7549e66d6c92..60e99499663e 100644
--- a/mobile/android/base/resources/layout/gecko_app.xml
+++ b/mobile/android/base/resources/layout/gecko_app.xml
@@ -146,7 +146,7 @@
                 <org.mozilla.gecko.ActionModeCompatView android:id="@+id/actionbar"
                                                         android:layout_height="match_parent"
                                                         android:layout_width="match_parent"
-                                                        style="@style/GeckoActionBar"/>
+                                                        style="@style/GeckoActionBar.ActionMode"/>
 
             </ViewFlipper>
 
diff --git a/mobile/android/base/resources/values/colors.xml b/mobile/android/base/resources/values/colors.xml
index 32b90d95e73e..1571bcf14dc3 100644
--- a/mobile/android/base/resources/values/colors.xml
+++ b/mobile/android/base/resources/values/colors.xml
@@ -138,4 +138,6 @@
 
   <color name="private_active_text">#FFFFFF</color>
 
+  <color name="action_bar_bg_color">@color/toolbar_grey</color>
+
 </resources>
diff --git a/mobile/android/base/resources/values/dimens.xml b/mobile/android/base/resources/values/dimens.xml
index 3ba37679e8ac..b30e6297763c 100644
--- a/mobile/android/base/resources/values/dimens.xml
+++ b/mobile/android/base/resources/values/dimens.xml
@@ -207,6 +207,10 @@
     <dimen name="find_in_page_control_margin_top">2dip</dimen>
     <dimen name="progress_bar_scroll_offset">1.5dp</dimen>
 
+    <!-- Matches the built-in divider height. fwiw, in the framework
+         I suspect this is a drawable rather than a dimen.  -->
+    <dimen name="action_bar_divider_height">2dp</dimen>
+
     <!-- http://blog.danlew.net/2015/01/06/handling-android-resources-with-non-standard-formats/ -->
     <item name="match_parent" type="dimen">-1</item>
     <item name="wrap_content" type="dimen">-2</item>
diff --git a/mobile/android/base/resources/values/styles.xml b/mobile/android/base/resources/values/styles.xml
index 3fc182c4e83c..85237b5000b3 100644
--- a/mobile/android/base/resources/values/styles.xml
+++ b/mobile/android/base/resources/values/styles.xml
@@ -662,11 +662,17 @@
         <item name="android:textStyle">bold</item>
     </style>
 
+    <!-- Ideally, we use the same style for the action bar & action mode, but unfortunately
+         some attrs that share a purpose have different names so instead we inherit. -->
     <style name="GeckoActionBar" parent="ThemeOverlay.AppCompat.ActionBar">
-        <item name="android:colorBackground">@color/toolbar_grey</item>
+        <item name="android:colorBackground">@color/action_bar_bg_color</item>
         <item name="colorAccent">@color/fennec_ui_orange</item>
         <item name="colorControlNormal">@color/toolbar_icon_grey</item>
     </style>
+    <style name="GeckoActionBar.ActionMode">
+        <item name="android:background">@color/action_bar_bg_color</item>
+        <!-- Note: the bottom divider is drawn in code. -->
+    </style>
 
     <style name="PreferencesActionBar" parent="Widget.AppCompat.ActionBar.Solid">
         <item name="displayOptions">showHome|homeAsUp|showTitle</item>