rename from mobile/android/app/src/main/res/drawable-hdpi/reader.png
rename to mobile/android/app/src/australis/res/drawable-hdpi/ic_readermode.png

rename from mobile/android/app/src/main/res/drawable-hdpi/reader_active.png
rename to mobile/android/app/src/australis/res/drawable-hdpi/ic_readermode_on.png

rename from mobile/android/app/src/main/res/drawable-xhdpi/reader.png
rename to mobile/android/app/src/australis/res/drawable-xhdpi/ic_readermode.png

rename from mobile/android/app/src/main/res/drawable-xhdpi/reader_active.png
rename to mobile/android/app/src/australis/res/drawable-xhdpi/ic_readermode_on.png

new file mode 100644
--- /dev/null
+++ b/mobile/android/app/src/photon/res/drawable/ic_readermode.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!-- 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/. -->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android" xmlns:gecko="http://schemas.android.com/apk/res-auto">
+
+    <!-- private browsing mode -->
+    <item android:drawable="@drawable/ic_readermode_pm" gecko:state_private="true" />
+
+    <!-- normal mode -->
+    <item android:drawable="@drawable/ic_readermode_nm" />
+
+</selector>

--- a/mobile/android/base/java/org/mozilla/gecko/util/UnusedResourcesUtil.java
+++ b/mobile/android/base/java/org/mozilla/gecko/util/UnusedResourcesUtil.java
@@ -39,22 +39,22 @@ final class UnusedResourcesUtil {
             R.drawable.alert_download,
             R.drawable.alert_download_animation,
             R.drawable.alert_mic,
             R.drawable.alert_mic_camera,
             R.drawable.casting,
             R.drawable.casting_active,
             R.drawable.close,
             R.drawable.homepage_banner_firstrun,
+            R.drawable.ic_readermode,
+            R.drawable.ic_readermode_on,
             R.drawable.icon_openinapp,
             R.drawable.pause,
             R.drawable.phone,
             R.drawable.play,
-            R.drawable.reader,
-            R.drawable.reader_active,
             R.drawable.sync_promo,
             R.drawable.undo_button_icon,
     };
 
     public static final int[] USED_IN_MANIFEST = {
             R.drawable.search_launcher,
             R.string.crash_reporter_title,
             R.xml.fxaccount_authenticator,

--- a/mobile/android/chrome/content/Reader.js
+++ b/mobile/android/chrome/content/Reader.js
@@ -174,31 +174,31 @@ var Reader = {
         title: title,
         clickCallback: () => this.pageAction.readerModeCallback(browser),
         important: true
       });
     };
 
     let browser = tab.browser;
     if (browser.currentURI.spec.startsWith("about:reader")) {
-      showPageAction("drawable://reader_active", Strings.reader.GetStringFromName("readerView.close"));
+      showPageAction("drawable://ic_readermode_on", Strings.reader.GetStringFromName("readerView.close"));
       // Only start a reader session if the viewer is in the foreground. We do
       // not track background reader viewers.
       UITelemetry.startSession("reader.1", null);
       return;
     }
 
     // not in ReaderMode, to make sure System UI is visible, not dimmed.
     this._showSystemUI(true);
 
     // Only stop a reader session if the foreground viewer is not visible.
     UITelemetry.stopSession("reader.1", "", null);
 
     if (browser.isArticle) {
-      showPageAction("drawable://reader", Strings.reader.GetStringFromName("readerView.enter"));
+      showPageAction("drawable://ic_readermode", Strings.reader.GetStringFromName("readerView.enter"));
       UITelemetry.addEvent("show.1", "button", null, "reader_available");
       this._sendMmaEvent("reader_available");
     } else {
       UITelemetry.addEvent("show.1", "button", null, "reader_unavailable");
     }
   },
 
   _sendMmaEvent: function(event) {