--- a/mobile/android/base/java/org/mozilla/gecko/BrowserApp.java
+++ b/mobile/android/base/java/org/mozilla/gecko/BrowserApp.java
@@ -29,17 +29,19 @@ import org.mozilla.gecko.favicons.Favico
 import org.mozilla.gecko.favicons.OnFaviconLoadedListener;
 import org.mozilla.gecko.favicons.decoders.IconDirectoryEntry;
 import org.mozilla.gecko.firstrun.FirstrunAnimationContainer;
 import org.mozilla.gecko.gfx.DynamicToolbarAnimator;
 import org.mozilla.gecko.gfx.ImmutableViewportMetrics;
 import org.mozilla.gecko.gfx.LayerView;
 import org.mozilla.gecko.home.BrowserSearch;
 import org.mozilla.gecko.home.HomeBanner;
+import org.mozilla.gecko.home.HomeConfig;
 import org.mozilla.gecko.home.HomeConfig.PanelType;
+import org.mozilla.gecko.home.HomeConfigPrefsBackend;
 import org.mozilla.gecko.home.HomePager;
 import org.mozilla.gecko.home.HomePager.OnUrlOpenInBackgroundListener;
 import org.mozilla.gecko.home.HomePager.OnUrlOpenListener;
 import org.mozilla.gecko.home.HomePanelsManager;
 import org.mozilla.gecko.home.SearchEngine;
 import org.mozilla.gecko.javaaddons.JavaAddonManager;
 import org.mozilla.gecko.menu.GeckoMenu;
 import org.mozilla.gecko.menu.GeckoMenuItem;
@@ -1740,16 +1742,19 @@ public class BrowserApp extends GeckoApp
             final BrowserDB db = getProfile().getDB();
             final ContentResolver cr = getContentResolver();
             Telemetry.addToHistogram("PLACES_PAGES_COUNT", db.getCount(cr, "history"));
             Telemetry.addToHistogram("FENNEC_BOOKMARKS_COUNT", db.getCount(cr, "bookmarks"));
             Telemetry.addToHistogram("FENNEC_READING_LIST_COUNT", db.getReadingListAccessor().getCount(cr));
             Telemetry.addToHistogram("BROWSER_IS_USER_DEFAULT", (isDefaultBrowser(Intent.ACTION_VIEW) ? 1 : 0));
             Telemetry.addToHistogram("FENNEC_TABQUEUE_ENABLED", (TabQueueHelper.isTabQueueEnabled(BrowserApp.this) ? 1 : 0));
             Telemetry.addToHistogram("FENNEC_CUSTOM_HOMEPAGE", (TextUtils.isEmpty(getHomepage()) ? 0 : 1));
+            final SharedPreferences prefs = GeckoSharedPrefs.forProfile(getContext());
+            final boolean hasCustomHomepanels = prefs.contains(HomeConfigPrefsBackend.PREFS_CONFIG_KEY) || prefs.contains(HomeConfigPrefsBackend.PREFS_CONFIG_KEY_OLD);
+            Telemetry.addToHistogram("FENNEC_HOMEPANELS_CUSTOM", hasCustomHomepanels ? 1 : 0);
 
             if (Versions.feature16Plus) {
                 Telemetry.addToHistogram("BROWSER_IS_ASSIST_DEFAULT", (isDefaultBrowser(Intent.ACTION_ASSIST) ? 1 : 0));
             }
 
             if (Restrictions.isRestrictedProfile(this)) {
                 for (Restrictable rest : RestrictedProfileConfiguration.getVisibleRestrictions()) {
                     int value = Restrictions.isAllowed(this, rest) ? 1 : 0;

--- a/mobile/android/base/java/org/mozilla/gecko/home/HomeConfigPrefsBackend.java
+++ b/mobile/android/base/java/org/mozilla/gecko/home/HomeConfigPrefsBackend.java
@@ -28,27 +28,27 @@ import android.content.BroadcastReceiver
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.support.v4.content.LocalBroadcastManager;
 import android.text.TextUtils;
 import android.util.Log;
 
-class HomeConfigPrefsBackend implements HomeConfigBackend {
+public class HomeConfigPrefsBackend implements HomeConfigBackend {
     private static final String LOGTAG = "GeckoHomeConfigBackend";
 
     // Increment this to trigger a migration.
     private static final int VERSION = 3;
 
     // This key was originally used to store only an array of panel configs.
-    private static final String PREFS_CONFIG_KEY_OLD = "home_panels";
+    public static final String PREFS_CONFIG_KEY_OLD = "home_panels";
 
     // This key is now used to store a version number with the array of panel configs.
-    private static final String PREFS_CONFIG_KEY = "home_panels_with_version";
+    public static final String PREFS_CONFIG_KEY = "home_panels_with_version";
 
     // Keys used with JSON object stored in prefs.
     private static final String JSON_KEY_PANELS = "panels";
     private static final String JSON_KEY_VERSION = "version";
 
     private static final String PREFS_LOCALE_KEY = "home_locale";
 
     private static final String RELOAD_BROADCAST = "HomeConfigPrefsBackend:Reload";

--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -5151,16 +5151,23 @@
     "expires_in_version": "never",
     "kind": "exponential",
     "low": 10,
     "high": "20000",
     "n_buckets": 20,
     "description": "Time for the home screen Top Sites query to return with no filter set (ms)",
     "cpp_guard": "ANDROID"
   },
+  "FENNEC_HOMEPANELS_CUSTOM": {
+    "expires_in_version": "54",
+    "kind": "boolean",
+    "bug_numbers": [1245368],
+    "description": "Whether the user has customized their homepanels",
+    "cpp_guard": "ANDROID"
+  },
   "FENNEC_WAS_KILLED": {
     "expires_in_version": "never",
     "kind": "flag",
     "description": "Killed, likely due to an OOM condition",
     "cpp_guard": "ANDROID"
   },
   "FIPS_ENABLED": {
     "alert_emails": ["seceng@mozilla.org"],