diff --git a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/GeckoEvent.java b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/GeckoEvent.java
index c70cf220c3be..93c5a36ec2a1 100644
--- a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/GeckoEvent.java
+++ b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/GeckoEvent.java
@@ -69,10 +69,6 @@ public class GeckoEvent {
         NATIVE_GESTURE_EVENT(31),
         CALL_OBSERVER(33),
         REMOVE_OBSERVER(34),
-        TELEMETRY_HISTOGRAM_ADD(37),
-        TELEMETRY_UI_SESSION_START(42),
-        TELEMETRY_UI_SESSION_STOP(43),
-        TELEMETRY_UI_EVENT(44),
         GAMEPAD_ADDREMOVE(45),
         GAMEPAD_DATA(46),
         LONG_PRESS(47);
@@ -343,50 +339,6 @@ public class GeckoEvent {
         return event;
     }
 
-    public static GeckoEvent createTelemetryHistogramAddEvent(String histogram,
-                                                              int value) {
-        GeckoEvent event = GeckoEvent.get(NativeGeckoEvent.TELEMETRY_HISTOGRAM_ADD);
-        event.mCharacters = histogram;
-        // Set the extras with null so that it cannot be mistaken with a keyed histogram.
-        event.mCharactersExtra = null;
-        event.mCount = value;
-        return event;
-    }
-
-    public static GeckoEvent createTelemetryKeyedHistogramAddEvent(String histogram,
-                                                                   String key,
-                                                                   int value) {
-        GeckoEvent event = GeckoEvent.get(NativeGeckoEvent.TELEMETRY_HISTOGRAM_ADD);
-        event.mCharacters = histogram;
-        event.mCharactersExtra = key;
-        event.mCount = value;
-        return event;
-    }
-
-    public static GeckoEvent createTelemetryUISessionStartEvent(String session, long timestamp) {
-        GeckoEvent event = GeckoEvent.get(NativeGeckoEvent.TELEMETRY_UI_SESSION_START);
-        event.mCharacters = session;
-        event.mTime = timestamp;
-        return event;
-    }
-
-    public static GeckoEvent createTelemetryUISessionStopEvent(String session, String reason, long timestamp) {
-        GeckoEvent event = GeckoEvent.get(NativeGeckoEvent.TELEMETRY_UI_SESSION_STOP);
-        event.mCharacters = session;
-        event.mCharactersExtra = reason;
-        event.mTime = timestamp;
-        return event;
-    }
-
-    public static GeckoEvent createTelemetryUIEvent(String action, String method, long timestamp, String extras) {
-        GeckoEvent event = GeckoEvent.get(NativeGeckoEvent.TELEMETRY_UI_EVENT);
-        event.mData = action;
-        event.mCharacters = method;
-        event.mCharactersExtra = extras;
-        event.mTime = timestamp;
-        return event;
-    }
-
     public static GeckoEvent createGamepadAddRemoveEvent(int id, boolean added) {
         GeckoEvent event = GeckoEvent.get(NativeGeckoEvent.GAMEPAD_ADDREMOVE);
         event.mID = id;
diff --git a/widget/android/AndroidJavaWrappers.cpp b/widget/android/AndroidJavaWrappers.cpp
index 5d3f5ea56336..42419bd0c3fc 100644
--- a/widget/android/AndroidJavaWrappers.cpp
+++ b/widget/android/AndroidJavaWrappers.cpp
@@ -320,34 +320,6 @@ AndroidGeckoEvent::Init(JNIEnv *jenv, jobject jobj)
             break;
         }
 
-        case TELEMETRY_HISTOGRAM_ADD: {
-            ReadCharactersField(jenv);
-            ReadCharactersExtraField(jenv);
-            mCount = jenv->GetIntField(jobj, jCountField);
-            break;
-        }
-
-        case TELEMETRY_UI_SESSION_START: {
-            ReadCharactersField(jenv);
-            mTime = jenv->GetLongField(jobj, jTimeField);
-            break;
-        }
-
-        case TELEMETRY_UI_SESSION_STOP: {
-            ReadCharactersField(jenv);
-            ReadCharactersExtraField(jenv);
-            mTime = jenv->GetLongField(jobj, jTimeField);
-            break;
-        }
-
-        case TELEMETRY_UI_EVENT: {
-            ReadCharactersField(jenv);
-            ReadCharactersExtraField(jenv);
-            ReadDataField(jenv);
-            mTime = jenv->GetLongField(jobj, jTimeField);
-            break;
-        }
-
         case GAMEPAD_ADDREMOVE: {
             mID = jenv->GetIntField(jobj, jIDField);
             break;
diff --git a/widget/android/AndroidJavaWrappers.h b/widget/android/AndroidJavaWrappers.h
index 68f22623a25f..5a2b9d02d901 100644
--- a/widget/android/AndroidJavaWrappers.h
+++ b/widget/android/AndroidJavaWrappers.h
@@ -583,11 +583,7 @@ public:
         NATIVE_GESTURE_EVENT = 31,
         CALL_OBSERVER = 33,
         REMOVE_OBSERVER = 34,
-        TELEMETRY_HISTOGRAM_ADD = 37,
         ADD_OBSERVER = 38,
-        TELEMETRY_UI_SESSION_START = 42,
-        TELEMETRY_UI_SESSION_STOP = 43,
-        TELEMETRY_UI_EVENT = 44,
         GAMEPAD_ADDREMOVE = 45,
         GAMEPAD_DATA = 46,
         LONG_PRESS = 47,
diff --git a/widget/android/nsAppShell.cpp b/widget/android/nsAppShell.cpp
index b2309d8662b2..6ae87b1b5445 100644
--- a/widget/android/nsAppShell.cpp
+++ b/widget/android/nsAppShell.cpp
@@ -671,63 +671,6 @@ nsAppShell::LegacyGeckoEvent::Run()
         break;
     }
 
-    case AndroidGeckoEvent::TELEMETRY_UI_SESSION_STOP: {
-        if (!nsAppShell::Get()->mBrowserApp)
-            break;
-        if (curEvent->Characters().Length() == 0)
-            break;
-
-        nsCOMPtr<nsIUITelemetryObserver> obs;
-        nsAppShell::Get()->mBrowserApp->GetUITelemetryObserver(getter_AddRefs(obs));
-        if (!obs)
-            break;
-
-        obs->StopSession(
-                curEvent->Characters().get(),
-                curEvent->CharactersExtra().get(),
-                curEvent->Time()
-                );
-        break;
-    }
-
-    case AndroidGeckoEvent::TELEMETRY_UI_SESSION_START: {
-        if (!nsAppShell::Get()->mBrowserApp)
-            break;
-        if (curEvent->Characters().Length() == 0)
-            break;
-
-        nsCOMPtr<nsIUITelemetryObserver> obs;
-        nsAppShell::Get()->mBrowserApp->GetUITelemetryObserver(getter_AddRefs(obs));
-        if (!obs)
-            break;
-
-        obs->StartSession(
-                curEvent->Characters().get(),
-                curEvent->Time()
-                );
-        break;
-    }
-
-    case AndroidGeckoEvent::TELEMETRY_UI_EVENT: {
-        if (!nsAppShell::Get()->mBrowserApp)
-            break;
-        if (curEvent->Data().Length() == 0)
-            break;
-
-        nsCOMPtr<nsIUITelemetryObserver> obs;
-        nsAppShell::Get()->mBrowserApp->GetUITelemetryObserver(getter_AddRefs(obs));
-        if (!obs)
-            break;
-
-        obs->AddEvent(
-                curEvent->Data().get(),
-                curEvent->Characters().get(),
-                curEvent->Time(),
-                curEvent->CharactersExtra().get()
-                );
-        break;
-    }
-
     case AndroidGeckoEvent::CALL_OBSERVER:
     {
         nsCOMPtr<nsIObserver> observer;
@@ -751,18 +694,6 @@ nsAppShell::LegacyGeckoEvent::Run()
         nsAppShell::Get()->AddObserver(curEvent->Characters(), curEvent->Observer());
         break;
 
-    case AndroidGeckoEvent::TELEMETRY_HISTOGRAM_ADD:
-        // If the extras field is not empty then this is a keyed histogram.
-        if (!curEvent->CharactersExtra().IsVoid()) {
-            Telemetry::Accumulate(NS_ConvertUTF16toUTF8(curEvent->Characters()).get(),
-                                  NS_ConvertUTF16toUTF8(curEvent->CharactersExtra()),
-                                  curEvent->Count());
-        } else {
-            Telemetry::Accumulate(NS_ConvertUTF16toUTF8(curEvent->Characters()).get(),
-                                  curEvent->Count());
-        }
-        break;
-
     case AndroidGeckoEvent::GAMEPAD_ADDREMOVE: {
 #ifdef MOZ_GAMEPAD
             RefPtr<GamepadPlatformService> service;