diff --git a/mobile/android/base/BrowserApp.java b/mobile/android/base/BrowserApp.java
index f7cf67b24770..f2c7a41ce57d 100644
--- a/mobile/android/base/BrowserApp.java
+++ b/mobile/android/base/BrowserApp.java
@@ -553,6 +553,12 @@ public class BrowserApp extends GeckoApp
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
+        if (!isSupportedSDK()) {
+            // This build does not support the Android version of the device; Exit early.
+            super.onCreate(savedInstanceState);
+            return;
+        }
+
         final Intent intent = getIntent();
 
         // Note that we're calling GeckoProfile.get *before GeckoApp.onCreate*.
@@ -1217,6 +1223,12 @@ public class BrowserApp extends GeckoApp
 
     @Override
     public void onDestroy() {
+        if (!isSupportedSDK()) {
+            // This build does not support the Android version of the device; Exit early.
+            super.onDestroy();
+            return;
+        }
+
         mDynamicToolbar.destroy();
 
         if (mBrowserToolbar != null)
diff --git a/mobile/android/base/GeckoApp.java b/mobile/android/base/GeckoApp.java
index a73cdf973b7e..01f4238e9766 100644
--- a/mobile/android/base/GeckoApp.java
+++ b/mobile/android/base/GeckoApp.java
@@ -64,6 +64,7 @@ import android.hardware.SensorEventListener;
 import android.location.Location;
 import android.location.LocationListener;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Environment;
 import android.os.Handler;
@@ -1220,6 +1221,14 @@ public abstract class GeckoApp
             enableStrictMode();
         }
 
+        if (!isSupportedSDK()) {
+            // This build does not support the Android version of the device: Show an error and finish the app.
+            super.onCreate(savedInstanceState);
+            showSDKVersionError();
+            finish();
+            return;
+        }
+
         // The clock starts...now. Better hurry!
         mJavaUiStartupTimer = new Telemetry.UptimeTimer("FENNEC_STARTUP_TIME_JAVAUI");
         mGeckoReadyStartupTimer = new Telemetry.UptimeTimer("FENNEC_STARTUP_TIME_GECKOREADY");
@@ -2133,6 +2142,13 @@ public abstract class GeckoApp
 
     @Override
     public void onDestroy() {
+        if (!isSupportedSDK()) {
+            // This build does not support the Android version of the device:
+            // We did not initialize anything, so skip cleaning up.
+            super.onDestroy();
+            return;
+        }
+
         EventDispatcher.getInstance().unregisterGeckoThreadListener((GeckoEventListener)this,
             "Gecko:Ready",
             "Gecko:DelayedStartup",
@@ -2235,6 +2251,16 @@ public abstract class GeckoApp
         }
     }
 
+    protected boolean isSupportedSDK() {
+        return Build.VERSION.SDK_INT >= Versions.MIN_SDK_VERSION &&
+               Build.VERSION.SDK_INT <= Versions.MAX_SDK_VERSION;
+    }
+
+    public void showSDKVersionError() {
+        final String message = getString(R.string.unsupported_sdk_version, Build.CPU_ABI, Build.VERSION.SDK_INT);
+        Toast.makeText(this, message, Toast.LENGTH_LONG).show();
+    }
+
     // Get a temporary directory, may return null
     public static File getTempDirectory() {
         File dir = GeckoApplication.get().getExternalFilesDir("temp");
diff --git a/mobile/android/base/locales/en-US/android_strings.dtd b/mobile/android/base/locales/en-US/android_strings.dtd
index 1b8aacef748f..47989134b6a4 100644
--- a/mobile/android/base/locales/en-US/android_strings.dtd
+++ b/mobile/android/base/locales/en-US/android_strings.dtd
@@ -748,3 +748,8 @@ just addresses the organization to follow, e.g. "This site is run by " -->
 <!ENTITY bookmarks_restricted_support2 "Firefox Help and Support for restricted profiles on Android tablets">
 <!-- LOCALIZATION NOTE (bookmarks_restricted_webmaker):link title for https://webmaker.org -->
 <!ENTITY bookmarks_restricted_webmaker "Learn the Web: Mozilla Webmaker">
+
+<!-- LOCALIZATION NOTE (unsupported_sdk_version): The user installed a build of this app that does not support
+     the Android version of this device. the formatS1 is replaced by the CPU ABI (e.g., ARMv7); the formatS2 is
+     replaced by the Android OS version (e.g., 14)-->
+<!ENTITY unsupported_sdk_version "Sorry! This &brandShortName; won\'t work on this device (&formatS1;, &formatS2;). Please download the correct version.">
diff --git a/mobile/android/base/strings.xml.in b/mobile/android/base/strings.xml.in
index b2c7f3a3fb45..6f0732979817 100644
--- a/mobile/android/base/strings.xml.in
+++ b/mobile/android/base/strings.xml.in
@@ -595,4 +595,6 @@
   <string name="intent_uri_private_browsing_multiple_match_title">&intent_uri_private_browsing_multiple_match_title;</string>
 
   <string name="devtools_auth_scan_header">&devtools_auth_scan_header;</string>
+
+  <string name="unsupported_sdk_version">&unsupported_sdk_version;</string>
 </resources>