diff --git a/mobile/android/base/GeckoApp.java b/mobile/android/base/GeckoApp.java
index 6a2a0552d2b8..4556415d659f 100644
--- a/mobile/android/base/GeckoApp.java
+++ b/mobile/android/base/GeckoApp.java
@@ -172,7 +172,6 @@ abstract public class GeckoApp
     public static int mOrientation;
     protected boolean mIsRestoringActivity;
     private String mCurrentResponse = "";
-    public static boolean sIsUsingCustomProfile = false;
 
     private ContactService mContactService;
     private PromptService mPromptService;
@@ -1175,7 +1174,7 @@ abstract public class GeckoApp
                         if (profileName == null)
                             profileName = "default";
                     }
-                    GeckoApp.sIsUsingCustomProfile = true;
+                    GeckoProfile.sIsUsingCustomProfile = true;
                 }
 
                 if (profileName != null || profilePath != null) {
diff --git a/mobile/android/base/GeckoProfile.java b/mobile/android/base/GeckoProfile.java
index ad514657719b..db2b8b9c13d2 100644
--- a/mobile/android/base/GeckoProfile.java
+++ b/mobile/android/base/GeckoProfile.java
@@ -35,6 +35,7 @@ public final class GeckoProfile {
     private final String mName;
     private File mMozDir;
     private File mDir;
+    public static boolean sIsUsingCustomProfile = false;
 
     // Constants to cache whether or not a profile is "locked".
     private enum LockState {
@@ -60,7 +61,13 @@ public final class GeckoProfile {
     }
 
     public static GeckoProfile get(Context context) {
-        if (context instanceof GeckoApp) {
+        boolean isGeckoApp = false;
+        try {
+            isGeckoApp = context instanceof GeckoApp;
+        } catch (NoClassDefFoundError ex) {}
+        
+
+        if (isGeckoApp) {
             // Check for a cached profile on this context already
             // TODO: We should not be caching profile information on the Activity context
             if (((GeckoApp)context).mProfile != null) {
@@ -74,7 +81,7 @@ public final class GeckoProfile {
             return guest;
         }
 
-        if (context instanceof GeckoApp) {
+        if (isGeckoApp) {
             // Otherwise, get the default profile for the Activity
             return get(context, ((GeckoApp)context).getDefaultProfileName());
         }
diff --git a/mobile/android/base/GeckoThread.java b/mobile/android/base/GeckoThread.java
index 7dd542ec9273..7b4d2f57648c 100644
--- a/mobile/android/base/GeckoThread.java
+++ b/mobile/android/base/GeckoThread.java
@@ -147,7 +147,7 @@ public class GeckoThread extends Thread implements GeckoEventListener {
                 if (args == null || !args.contains(BrowserApp.GUEST_BROWSING_ARG)) {
                     guest = " " + BrowserApp.GUEST_BROWSING_ARG;
                 }
-            } else if (!GeckoApp.sIsUsingCustomProfile) {
+            } else if (!GeckoProfile.sIsUsingCustomProfile) {
                 // If nothing was passed in in the intent, force Gecko to use the default profile for
                 // for this activity
                 profile = " -P " + GeckoAppShell.getGeckoInterface().getProfile().getName();
diff --git a/mobile/android/base/GeckoView.java b/mobile/android/base/GeckoView.java
index 22d268566e16..c17cda45a3d5 100644
--- a/mobile/android/base/GeckoView.java
+++ b/mobile/android/base/GeckoView.java
@@ -46,7 +46,12 @@ public class GeckoView extends LayerView
 
         // If running outside of a GeckoActivity (eg, from a library project),
         // load the native code and disable content providers
-        if (!(context instanceof GeckoActivity)) {
+        boolean isGeckoActivity = false;
+        try {
+            isGeckoActivity = context instanceof GeckoActivity;
+        } catch (NoClassDefFoundError ex) {}
+
+        if (!isGeckoActivity) {
             // Set the GeckoInterface if the context is an activity and the GeckoInterface
             // has not already been set
             if (context instanceof Activity && getGeckoInterface() == null) {
@@ -59,7 +64,7 @@ public class GeckoView extends LayerView
 
             GeckoLoader.loadMozGlue();
             BrowserDB.setEnableContentProviders(false);
-        }
+         }
 
         if (url != null) {
             GeckoThread.setUri(url);
diff --git a/mobile/android/base/gfx/GeckoLayerClient.java b/mobile/android/base/gfx/GeckoLayerClient.java
index d202e55e80cc..967c167be07f 100644
--- a/mobile/android/base/gfx/GeckoLayerClient.java
+++ b/mobile/android/base/gfx/GeckoLayerClient.java
@@ -896,16 +896,20 @@ public class GeckoLayerClient implements LayerView.Listener, PanZoomTarget
     }
 
     private void setShadowVisibility() {
-        ThreadUtils.postToUiThread(new Runnable() {
-            @Override
-            public void run() {
-                if (BrowserApp.mBrowserToolbar == null) {
-                    return;
+        try {
+            if (BrowserApp.mBrowserToolbar == null) // this will throw if we don't have BrowserApp
+                return;
+            ThreadUtils.postToUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    if (BrowserApp.mBrowserToolbar == null) {
+                        return;
+                    }
+                    ImmutableViewportMetrics m = mViewportMetrics;
+                    BrowserApp.mBrowserToolbar.setShadowVisibility(m.viewportRectTop >= m.pageRectTop);
                 }
-                ImmutableViewportMetrics m = mViewportMetrics;
-                BrowserApp.mBrowserToolbar.setShadowVisibility(m.viewportRectTop >= m.pageRectTop);
-            }
-        });
+            });
+        } catch (NoClassDefFoundError ex) {}
     }
 
     /** Implementation of PanZoomTarget */