--- a/gfx/layers/basic/BasicLayerManager.cpp
+++ b/gfx/layers/basic/BasicLayerManager.cpp
@@ -5,16 +5,17 @@
 
 #include "mozilla/layers/PLayerChild.h"
 #include "mozilla/layers/PLayersChild.h"
 #include "mozilla/layers/PLayersParent.h"
 
 #include "gfxSharedImageSurface.h"
 #include "gfxImageSurface.h"
 #include "gfxUtils.h"
+#include "nsXULAppAPI.h"
 #include "RenderTrace.h"
 #include "sampler.h"
 
 #define PIXMAN_DONT_DEFINE_STDINT
 #include "pixman.h"
 
 #include "BasicTiledThebesLayer.h"
 #include "BasicLayersImpl.h"
@@ -945,17 +946,18 @@ BasicShadowLayerManager::BeginTransactio
   // If the last transaction was incomplete (a failed DoEmptyTransaction),
   // don't signal a new transaction to ShadowLayerForwarder. Carry on adding
   // to the previous transaction.
   if (HasShadowManager()) {
     ShadowLayerForwarder::BeginTransaction();
 
     // If we have a non-default target, we need to let our shadow manager draw
     // to it. This will happen at the end of the transaction.
-    if (aTarget && (aTarget != mDefaultTarget)) {
+    if (aTarget && (aTarget != mDefaultTarget) &&
+        XRE_GetProcessType() == GeckoProcessType_Default) {
       mShadowTarget = aTarget;
 
       // Create a temporary target for ourselves, so that mShadowTarget is only
       // drawn to by our shadow manager.
       nsRefPtr<gfxASurface> targetSurface = gfxPlatform::GetPlatform()->
         CreateOffscreenSurface(aTarget->OriginalSurface()->GetSize(),
                                aTarget->OriginalSurface()->GetContentType());
       targetContext = new gfxContext(targetSurface);