diff --git a/image/src/imgLoader.cpp b/image/src/imgLoader.cpp
index 9d0742234802..52f1e5466c60 100644
--- a/image/src/imgLoader.cpp
+++ b/image/src/imgLoader.cpp
@@ -28,6 +28,7 @@
 #include "nsIAsyncVerifyRedirectCallback.h"
 #include "nsIFileURL.h"
 #include "nsCRT.h"
+#include "nsIDocument.h"
 #include "nsINetworkPredictor.h"
 
 #include "nsIApplicationCache.h"
@@ -2045,6 +2046,12 @@ nsresult imgLoader::LoadImage(nsIURI *aURI,
       timedChannel->SetInitiatorType(initiatorType);
     }
 
+    // Pass the inner window ID of the loading document, if possible.
+    nsCOMPtr<nsIDocument> doc = do_QueryInterface(aCX);
+    if (doc) {
+      request->SetInnerWindowID(doc->InnerWindowID());
+    }
+
     // create the proxy listener
     nsCOMPtr<nsIStreamListener> pl = new ProxyListener(request.get());
 
@@ -2508,8 +2515,7 @@ NS_IMPL_ISUPPORTS(imgCacheValidator, nsIStreamListener, nsIRequestObserver,
 
 imgCacheValidator::imgCacheValidator(nsProgressNotificationProxy* progress,
                                      imgLoader* loader, imgRequest *request,
-                                     nsISupports* aContext,
-                                     bool forcePrincipalCheckForCacheEntry)
+                                     void *aContext, bool forcePrincipalCheckForCacheEntry)
  : mProgressProxy(progress),
    mRequest(request),
    mContext(aContext),
diff --git a/image/src/imgLoader.h b/image/src/imgLoader.h
index 8fbb872c8de3..e6a38fda575f 100644
--- a/image/src/imgLoader.h
+++ b/image/src/imgLoader.h
@@ -497,8 +497,7 @@ class imgCacheValidator : public nsIStreamListener,
 {
 public:
   imgCacheValidator(nsProgressNotificationProxy* progress, imgLoader* loader,
-                    imgRequest* aRequest, nsISupports* aContext,
-                    bool forcePrincipalCheckForCacheEntry);
+                    imgRequest *request, void *aContext, bool forcePrincipalCheckForCacheEntry);
 
   void AddProxy(imgRequestProxy *aProxy);
 
@@ -524,7 +523,7 @@ private:
   nsRefPtr<imgRequest> mNewRequest;
   nsRefPtr<imgCacheEntry> mNewEntry;
 
-  nsCOMPtr<nsISupports> mContext;
+  void *mContext;
 
   imgLoader* mImgLoader;
 };
diff --git a/image/src/imgRequest.cpp b/image/src/imgRequest.cpp
index b12d36a6e51e..8aef9b748ee4 100644
--- a/image/src/imgRequest.cpp
+++ b/image/src/imgRequest.cpp
@@ -18,7 +18,6 @@
 
 #include "nsIChannel.h"
 #include "nsICachingChannel.h"
-#include "nsIDocument.h"
 #include "nsIThreadRetargetableRequest.h"
 #include "nsIInputStream.h"
 #include "nsIMultiPartChannel.h"
@@ -96,7 +95,7 @@ nsresult imgRequest::Init(nsIURI *aURI,
                           nsIRequest *aRequest,
                           nsIChannel *aChannel,
                           imgCacheEntry *aCacheEntry,
-                          nsISupports* aCX,
+                          void *aLoadId,
                           nsIPrincipal* aLoadingPrincipal,
                           int32_t aCORSMode,
                           ReferrerPolicy aReferrerPolicy)
@@ -133,13 +132,7 @@ nsresult imgRequest::Init(nsIURI *aURI,
 
   mCacheEntry = aCacheEntry;
 
-  SetLoadId(aCX);
-
-  // Grab the inner window ID of the loading document, if possible.
-  nsCOMPtr<nsIDocument> doc = do_QueryInterface(aCX);
-  if (doc) {
-    mInnerWindowId = doc->InnerWindowID();
-  }
+  SetLoadId(aLoadId);
 
   return NS_OK;
 }
diff --git a/image/src/imgRequest.h b/image/src/imgRequest.h
index e81afb0f0e53..179afdd34b4c 100644
--- a/image/src/imgRequest.h
+++ b/image/src/imgRequest.h
@@ -65,7 +65,7 @@ public:
                 nsIRequest *aRequest,
                 nsIChannel *aChannel,
                 imgCacheEntry *aCacheEntry,
-                nsISupports* aCX,
+                void *aLoadId,
                 nsIPrincipal* aLoadingPrincipal,
                 int32_t aCORSMode,
                 ReferrerPolicy aReferrerPolicy);
@@ -91,6 +91,10 @@ public:
   // Request that we start decoding the image as soon as data becomes available.
   void RequestDecode() { mDecodeRequested = true; }
 
+  inline void SetInnerWindowID(uint64_t aInnerWindowId) {
+    mInnerWindowId = aInnerWindowId;
+  }
+
   inline uint64_t InnerWindowID() const {
     return mInnerWindowId;
   }