diff -r 000000000000 -r 6474c204b198 mobile/android/base/ReaderModeUtils.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/ReaderModeUtils.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,48 @@
+/* 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;
+
+import org.mozilla.gecko.util.StringUtils;
+
+import android.net.Uri;
+
+public class ReaderModeUtils {
+    private static final String LOGTAG = "ReaderModeUtils";
+
+    public static String getUrlFromAboutReader(String aboutReaderUrl) {
+        return StringUtils.getQueryParameter(aboutReaderUrl, "url");
+    }
+
+    public static boolean isEnteringReaderMode(String currentUrl, String newUrl) {
+        if (currentUrl == null || newUrl == null) {
+            return false;
+        }
+
+        if (!AboutPages.isAboutReader(newUrl)) {
+            return false;
+        }
+
+        String urlFromAboutReader = getUrlFromAboutReader(newUrl);
+        if (urlFromAboutReader == null) {
+            return false;
+        }
+
+        return urlFromAboutReader.equals(currentUrl);
+    }
+
+    public static String getAboutReaderForUrl(String url) {
+        return getAboutReaderForUrl(url, -1);
+    }
+
+    public static String getAboutReaderForUrl(String url, int tabId) {
+        String aboutReaderUrl = AboutPages.READER + "?url=" + Uri.encode(url);
+
+        if (tabId >= 0) {
+            aboutReaderUrl += "&tabId=" + tabId;
+        }
+
+        return aboutReaderUrl;
+    }
+}