diff --git a/mobile/android/base/TabsAccessor.java b/mobile/android/base/TabsAccessor.java
index 6cd6a9a93cab..f9629f067c4e 100644
--- a/mobile/android/base/TabsAccessor.java
+++ b/mobile/android/base/TabsAccessor.java
@@ -7,7 +7,6 @@ package org.mozilla.gecko;
 import org.mozilla.gecko.db.BrowserContract;
 import org.mozilla.gecko.util.ThreadUtils;
 import org.mozilla.gecko.util.UiAsyncTask;
-
 import org.json.JSONArray;
 import org.json.JSONException;
 
@@ -34,7 +33,8 @@ public final class TabsAccessor {
                                                                 BrowserContract.Tabs.TITLE,
                                                                 BrowserContract.Tabs.URL,
                                                                 BrowserContract.Clients.GUID,
-                                                                BrowserContract.Clients.NAME
+                                                                BrowserContract.Clients.NAME,
+                                                                BrowserContract.Clients.LAST_MODIFIED,
                                                             };
 
     // Projection column numbers
@@ -42,7 +42,8 @@ public final class TabsAccessor {
         TITLE,
         URL,
         GUID,
-        NAME
+        NAME,
+        LAST_MODIFIED,
     };
 
     private static final String CLIENTS_SELECTION = BrowserContract.Clients.GUID + " IS NOT NULL";
@@ -57,6 +58,11 @@ public final class TabsAccessor {
         public String url;
         public String guid;
         public String name;
+        /**
+         * This is the last time the remote client uploaded a tabs record; that
+         * is, it is not per tab, but per remote client.
+         */
+        public long lastModified;
     }
 
     public interface OnQueryTabsCompleteListener {
@@ -105,7 +111,8 @@ public final class TabsAccessor {
                         tab.url = cursor.getString(TABS_COLUMN.URL.ordinal());
                         tab.guid = cursor.getString(TABS_COLUMN.GUID.ordinal());
                         tab.name = cursor.getString(TABS_COLUMN.NAME.ordinal());
-                
+                        tab.lastModified = cursor.getLong(TABS_COLUMN.LAST_MODIFIED.ordinal());
+
                         tabs.add(tab);
                     }
                 } finally {
diff --git a/mobile/android/base/TelemetryContract.java b/mobile/android/base/TelemetryContract.java
index bd7d3ae7fe1e..a4488c8ce93a 100644
--- a/mobile/android/base/TelemetryContract.java
+++ b/mobile/android/base/TelemetryContract.java
@@ -49,6 +49,10 @@ public interface TelemetryContract {
 
         // Generic action, usually for tracking menu and toolbar actions.
         public static final String ACTION = "action.1";
+
+        // Launching (opening) an external application
+        // Note: Only used in JavaScript for now, but here for completeness.
+        public static final String LAUNCH = "launch.1";
     }
 
     /**
@@ -82,6 +86,10 @@ public interface TelemetryContract {
 
         // Action triggered from a suggestion provided to the user.
         public static final String SUGGESTION = "suggestion";
+
+        // Action triggered from a pageaction in the URLBar.
+        // Note: Only used in JavaScript for now, but here for completeness.
+        public static final String PAGEACTION = "pageaction";
     }
 
     /**
@@ -101,10 +109,10 @@ public interface TelemetryContract {
         public static final String READER = "reader.1";
 
         // URL bar focused.
-        public static final String URLBAR_FOCUSED = "urlbar.1:";
+        public static final String URLBAR_FOCUSED = "urlbar.1";
 
         // Awesomescreen frecency search is active.
-        public static final String FRECENCY = "frecency.1:";
+        public static final String FRECENCY = "frecency.1";
     }
 
     /**
diff --git a/mobile/android/base/locales/en-US/android_strings.dtd b/mobile/android/base/locales/en-US/android_strings.dtd
index 90a170eb81be..8e4a9d2cdffb 100644
--- a/mobile/android/base/locales/en-US/android_strings.dtd
+++ b/mobile/android/base/locales/en-US/android_strings.dtd
@@ -434,3 +434,11 @@ just addresses the organization to follow, e.g. "This site is run by " -->
      They are never shown to users -->
 <!ENTITY actionbar_menu "Menu">
 <!ENTITY actionbar_done "Done">
+
+<!-- Localization note (remote_tabs_last_synced): the variable is replaced by a
+     "relative time span string" produced by Android.  This string describes the
+     time the tabs were last synced relative to the current time; examples
+     include "42 minutes ago", "4 days ago", "last week", etc. The subject of
+     "Last synced" is one of the user's other Sync clients, typically Firefox on
+     their desktop or laptop.-->
+<!ENTITY remote_tabs_last_synced "Last synced: &formatS;">
diff --git a/mobile/android/base/resources/layout-xlarge-v11/remote_tabs_child.xml b/mobile/android/base/resources/layout-xlarge-v11/remote_tabs_child.xml
index 2715cc2a10b3..ff0ec06934d8 100644
--- a/mobile/android/base/resources/layout-xlarge-v11/remote_tabs_child.xml
+++ b/mobile/android/base/resources/layout-xlarge-v11/remote_tabs_child.xml
@@ -4,24 +4,24 @@
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:background="@drawable/action_bar_button_inverse"
+              android:gravity="center_vertical"
               android:layout_width="fill_parent"
               android:layout_height="@dimen/remote_tab_child_row_height"
-              android:gravity="center_vertical"
               android:orientation="vertical"
-              android:background="@drawable/action_bar_button_inverse"
               android:paddingLeft="2dp"
               android:paddingRight="2dp">
 
     <TextView android:id="@+id/tab"
+              style="@style/TabRowTextAppearance"
               android:layout_width="fill_parent"
               android:layout_height="wrap_content"
-              style="@style/TabRowTextAppearance"
               android:textSize="14sp"/>
 
     <TextView android:id="@+id/url"
+              style="@style/TabRowTextAppearance.Url"
               android:layout_width="fill_parent"
               android:layout_height="wrap_content"
-              style="@style/TabRowTextAppearance.Url"
               android:textSize="12sp"/>
 
 </LinearLayout>
diff --git a/mobile/android/base/resources/layout-xlarge-v11/remote_tabs_group.xml b/mobile/android/base/resources/layout-xlarge-v11/remote_tabs_group.xml
index 887bd903c2a7..54b08d0fc295 100644
--- a/mobile/android/base/resources/layout-xlarge-v11/remote_tabs_group.xml
+++ b/mobile/android/base/resources/layout-xlarge-v11/remote_tabs_group.xml
@@ -3,16 +3,28 @@
    - 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/. -->
 
-<org.mozilla.gecko.widget.AllCapsTextView xmlns:android="http://schemas.android.com/apk/res/android"
-                                          android:id="@+id/client"
-                                          android:layout_width="fill_parent"
-                                          android:layout_height="@dimen/remote_tab_group_row_height"
-                                          style="@style/TabRowTextAppearance.Url"
-                                          android:background="@android:color/transparent"
-                                          android:paddingLeft="2dip"
-                                          android:paddingRight="2dip"
-                                          android:textStyle="bold"
-                                          android:textSize="12sp"
-                                          android:singleLine="false"
-                                          android:maxLines="2"
-                                          android:gravity="center_vertical"/>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:background="@android:color/transparent"
+              android:layout_width="fill_parent"
+              android:layout_height="@dimen/remote_tab_child_row_height"
+              android:gravity="center_vertical"
+              android:orientation="vertical"
+              android:paddingLeft="2dp"
+              android:paddingRight="2dp">
+
+    <org.mozilla.gecko.widget.AllCapsTextView android:id="@+id/client"
+                                              style="@style/TabRowTextAppearance"
+                                              android:layout_width="fill_parent"
+                                              android:layout_height="wrap_content"
+                                              android:maxLines="2"
+                                              android:singleLine="false"
+                                              android:textSize="14sp"
+                                              android:textStyle="bold" />
+
+    <TextView android:id="@+id/last_synced"
+              style="@style/TabRowTextAppearance.Url"
+              android:layout_width="fill_parent"
+              android:layout_height="wrap_content"
+              android:textSize="12sp"/>
+
+</LinearLayout>
diff --git a/mobile/android/base/resources/layout/remote_tabs_child.xml b/mobile/android/base/resources/layout/remote_tabs_child.xml
index 23fe57bc9247..32f79a8e53ab 100644
--- a/mobile/android/base/resources/layout/remote_tabs_child.xml
+++ b/mobile/android/base/resources/layout/remote_tabs_child.xml
@@ -4,25 +4,25 @@
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:background="@android:color/transparent"
+              android:gravity="center_vertical"
               android:layout_width="fill_parent"
               android:layout_height="@dimen/remote_tab_child_row_height"
-              android:gravity="center_vertical"
               android:orientation="vertical"
-              android:background="@drawable/action_bar_button_inverse"
               android:paddingLeft="4dp"
               android:paddingRight="4dp">
 
     <TextView android:id="@+id/tab"
+              style="@style/TabRowTextAppearance"
               android:layout_width="fill_parent"
               android:layout_height="wrap_content"
-              style="@style/TabRowTextAppearance"
-              android:textSize="18sp"/>
+              android:textSize="18sp" />
 
     <TextView android:id="@+id/url"
+              style="@style/TabRowTextAppearance.Url"
               android:layout_width="fill_parent"
               android:layout_height="wrap_content"
-              style="@style/TabRowTextAppearance.Url"
-              android:textSize="14sp"
-              android:maxLength="1024"/>
+              android:maxLength="1024"
+              android:textSize="14sp" />
 
 </LinearLayout>
diff --git a/mobile/android/base/resources/layout/remote_tabs_group.xml b/mobile/android/base/resources/layout/remote_tabs_group.xml
index 7f776651458f..3a4f134acd13 100644
--- a/mobile/android/base/resources/layout/remote_tabs_group.xml
+++ b/mobile/android/base/resources/layout/remote_tabs_group.xml
@@ -3,14 +3,27 @@
    - 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/. -->
 
-<org.mozilla.gecko.widget.AllCapsTextView xmlns:android="http://schemas.android.com/apk/res/android"
-                                          android:id="@+id/client"
-                                          android:layout_width="fill_parent"
-                                          android:layout_height="@dimen/remote_tab_group_row_height"
-                                          style="@style/TabRowTextAppearance.Url"
-                                          android:background="@android:color/transparent"
-                                          android:paddingLeft="4dp"
-                                          android:paddingRight="4dp"
-                                          android:textStyle="bold"
-                                          android:textSize="14sp"
-                                          android:gravity="center_vertical"/>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:background="@android:color/transparent"
+              android:layout_width="fill_parent"
+              android:layout_height="@dimen/remote_tab_child_row_height"
+              android:gravity="center_vertical"
+              android:orientation="vertical"
+              android:paddingLeft="4dp"
+              android:paddingRight="4dp" >
+
+    <org.mozilla.gecko.widget.AllCapsTextView android:id="@+id/client"
+                                              style="@style/TabRowTextAppearance"
+                                              android:layout_width="fill_parent"
+                                              android:layout_height="@dimen/remote_tab_group_row_height"
+                                              android:textSize="18sp"
+                                              android:textStyle="bold" />
+
+    <TextView android:id="@+id/last_synced"
+              style="@style/TabRowTextAppearance.Url"
+              android:layout_width="fill_parent"
+              android:layout_height="wrap_content"
+              android:maxLength="1024"
+              android:textSize="14sp" />
+
+</LinearLayout>
diff --git a/mobile/android/base/strings.xml.in b/mobile/android/base/strings.xml.in
index d19a990d8ab9..d54e375cb778 100644
--- a/mobile/android/base/strings.xml.in
+++ b/mobile/android/base/strings.xml.in
@@ -404,4 +404,5 @@
   <!-- Miscellaneous -->
   <string name="ellipsis">&ellipsis;</string>
 
+  <string name="remote_tabs_last_synced">&remote_tabs_last_synced;</string>
 </resources>
diff --git a/mobile/android/base/tabspanel/RemoteTabsList.java b/mobile/android/base/tabspanel/RemoteTabsList.java
index 669e83af8487..6f95bdbac7c8 100644
--- a/mobile/android/base/tabspanel/RemoteTabsList.java
+++ b/mobile/android/base/tabspanel/RemoteTabsList.java
@@ -4,14 +4,6 @@
 
 package org.mozilla.gecko.tabspanel;
 
-import android.content.Context;
-import android.text.TextUtils;
-import android.util.AttributeSet;
-import android.view.View;
-import android.view.ViewGroup;
-import android.widget.ExpandableListView;
-import android.widget.SimpleExpandableListAdapter;
-
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -22,6 +14,14 @@ import org.mozilla.gecko.TabsAccessor;
 import org.mozilla.gecko.Telemetry;
 import org.mozilla.gecko.TelemetryContract;
 
+import android.content.Context;
+import android.text.TextUtils;
+import android.text.format.DateUtils;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.ExpandableListView;
+import android.widget.SimpleExpandableListAdapter;
+
 /**
  * The actual list of synced tabs. This serves as the only child view of {@link RemoteTabsContainer}
  * so it can be refreshed using a swipe-to-refresh gesture.
@@ -30,9 +30,9 @@ class RemoteTabsList extends ExpandableListView
                      implements ExpandableListView.OnGroupClickListener,
                                 ExpandableListView.OnChildClickListener,
                                 TabsAccessor.OnQueryTabsCompleteListener {
-    private static final String[] CLIENT_KEY = new String[] { "name" };
+    private static final String[] CLIENT_KEY = new String[] { "name", "last_synced" };
     private static final String[] TAB_KEY = new String[] { "title", "url" };
-    private static final int[] CLIENT_RESOURCE = new int[] { R.id.client };
+    private static final int[] CLIENT_RESOURCE = new int[] { R.id.client, R.id.last_synced };
     private static final int[] TAB_RESOURCE = new int[] { R.id.tab, R.id.url };
 
     private final Context context;
@@ -92,10 +92,13 @@ class RemoteTabsList extends ExpandableListView
         HashMap <String, String> client;
         HashMap <String, String> tab;
 
+        final long now = System.currentTimeMillis();
+
         for (TabsAccessor.RemoteTab remoteTab : remoteTabs) {
             if (oldGuid == null || !TextUtils.equals(oldGuid, remoteTab.guid)) {
                 client = new HashMap <String, String>();
                 client.put("name", remoteTab.name);
+                client.put("last_synced", getLastSyncedString(now, remoteTab.lastModified));
                 clients.add(client);
 
                 tabsForClient = new ArrayList <HashMap <String, String>>();
@@ -124,4 +127,16 @@ class RemoteTabsList extends ExpandableListView
             expandGroup(i);
         }
     }
+
+    /**
+     * Return a relative "Last synced" time span for the given tab record.
+     *
+     * @param now local time.
+     * @param time to format string for.
+     * @return string describing time span
+     */
+    protected String getLastSyncedString(long now, long time) {
+        CharSequence relativeTimeSpanString = DateUtils.getRelativeTimeSpanString(time, now, DateUtils.MINUTE_IN_MILLIS);
+        return getResources().getString(R.string.remote_tabs_last_synced, relativeTimeSpanString);
+    }
 }
diff --git a/mobile/android/chrome/content/browser.js b/mobile/android/chrome/content/browser.js
index 9edd5d04500a..f2bc233d41d7 100644
--- a/mobile/android/chrome/content/browser.js
+++ b/mobile/android/chrome/content/browser.js
@@ -8101,6 +8101,10 @@ var ExternalApps = {
       icon: "drawable://icon_openinapp",
 
       clickCallback: () => {
+        // Create a relative timestamp for telemetry
+        let uptime = Date.now() - Services.startup.getStartupInfo().linkerInitialized;
+        UITelemetry.addEvent("launch.1", "pageaction", uptime, "helper");
+
         if (apps.length > 1) {
           // Use the HelperApps prompt here to filter out any Http handlers
           HelperApps.prompt(apps, {
diff --git a/mobile/android/installer/Makefile.in b/mobile/android/installer/Makefile.in
index 763680a9158b..96dceab183f2 100644
--- a/mobile/android/installer/Makefile.in
+++ b/mobile/android/installer/Makefile.in
@@ -46,15 +46,22 @@ DEFINES += -DENABLE_MARIONETTE=1
 endif
 
 ifdef MOZ_PKG_MANIFEST_P
-$(MOZ_PKG_MANIFEST): $(MOZ_PKG_MANIFEST_P) $(GLOBAL_DEPS)
+# When MOZ_CHROME_MULTILOCALE is defined, we write multilocale.json like:
+# {"locales": ["en-US", "de", "ar", ...]}
+
+$(MOZ_PKG_MANIFEST): $(MOZ_PKG_MANIFEST_P) $(GLOBAL_DEPS) FORCE
 	$(call py_action,preprocessor,$(DEFINES) $(ACDEFINES) $< -o $@)
 ifdef MOZ_CHROME_MULTILOCALE
 	printf '\n[multilocale]\n' >> $@
+	printf '@BINPATH@/res/multilocale.json\n' >> $@
 	for LOCALE in en-US $(MOZ_CHROME_MULTILOCALE) ;\
 	do \
 	  printf '$(BINPATH)/chrome/'"$$LOCALE"'$(JAREXT)\n' >> $@; \
 	  printf '$(BINPATH)/chrome/'"$$LOCALE"'.manifest\n' >> $@; \
 	done
+	COMMA=,
+	echo '{"locales": [$(foreach l,$(MOZ_CHROME_MULTILOCALE),"$(l)"$(COMMA)) "en-US"]}' \
+	  > $(FINAL_TARGET)/res/multilocale.json
 endif
 
 GARBAGE += $(MOZ_PKG_MANIFEST)