diff --git a/netwerk/protocol/http/HttpChannelParent.cpp b/netwerk/protocol/http/HttpChannelParent.cpp
index 464cbe7647d..d1592e3eaf4 100644
--- a/netwerk/protocol/http/HttpChannelParent.cpp
+++ b/netwerk/protocol/http/HttpChannelParent.cpp
@@ -43,7 +43,6 @@
 #include "mozilla/net/NeckoParent.h"
 #include "mozilla/unused.h"
 #include "HttpChannelParentListener.h"
-#include "nsHttpChannel.h"
 #include "nsHttpHandler.h"
 #include "nsNetUtil.h"
 #include "nsISupportsPriority.h"
@@ -394,8 +393,11 @@ HttpChannelParent::RecvDocumentChannelCleanup()
 bool 
 HttpChannelParent::RecvMarkOfflineCacheEntryAsForeign()
 {
-  nsHttpChannel *httpChan = static_cast<nsHttpChannel *>(mChannel.get());
-  httpChan->MarkOfflineCacheEntryAsForeign();
+  if (mOfflineForeignMarker) {
+    mOfflineForeignMarker->MarkAsForeign();
+    mOfflineForeignMarker = 0;
+  }
+
   return true;
 }
 
@@ -421,6 +423,7 @@ HttpChannelParent::OnStartRequest(nsIRequest *aRequest, nsISupports *aContext)
   bool loadedFromApplicationCache;
   chan->GetLoadedFromApplicationCache(&loadedFromApplicationCache);
   if (loadedFromApplicationCache) {
+    mOfflineForeignMarker = chan->GetOfflineCacheEntryAsForeignMarker();
     nsCOMPtr<nsIApplicationCache> appCache;
     chan->GetApplicationCache(getter_AddRefs(appCache));
     nsCString appCacheGroupId;
diff --git a/netwerk/protocol/http/HttpChannelParent.h b/netwerk/protocol/http/HttpChannelParent.h
index 6cfc3a6bf3b..f061d56932c 100644
--- a/netwerk/protocol/http/HttpChannelParent.h
+++ b/netwerk/protocol/http/HttpChannelParent.h
@@ -49,6 +49,7 @@
 #include "nsIParentRedirectingChannel.h"
 #include "nsIProgressEventSink.h"
 #include "nsITabParent.h"
+#include "nsHttpChannel.h"
 
 using namespace mozilla::dom;
 
@@ -128,6 +129,8 @@ private:
   nsCOMPtr<nsIChannel> mRedirectChannel;
   nsCOMPtr<nsIAsyncVerifyRedirectCallback> mRedirectCallback;
 
+  nsAutoPtr<class nsHttpChannel::OfflineCacheEntryAsForeignMarker> mOfflineForeignMarker;
+
   // state for combining OnStatus/OnProgress with OnDataAvailable
   // into one IPDL call to child.
   nsresult mStoredStatus;
diff --git a/netwerk/protocol/http/nsHttpChannel.cpp b/netwerk/protocol/http/nsHttpChannel.cpp
index c2939d66c5b..5726536b8f8 100644
--- a/netwerk/protocol/http/nsHttpChannel.cpp
+++ b/netwerk/protocol/http/nsHttpChannel.cpp
@@ -5176,20 +5176,40 @@ nsHttpChannel::SetChooseApplicationCache(bool aChoose)
     return NS_OK;
 }
 
-NS_IMETHODIMP
-nsHttpChannel::MarkOfflineCacheEntryAsForeign()
+nsHttpChannel::OfflineCacheEntryAsForeignMarker*
+nsHttpChannel::GetOfflineCacheEntryAsForeignMarker()
 {
     if (!mApplicationCache)
-        return NS_ERROR_NOT_AVAILABLE;
+        return nsnull;
 
     nsresult rv;
 
     nsCAutoString cacheKey;
     rv = GenerateCacheKey(mPostID, cacheKey);
-    NS_ENSURE_SUCCESS(rv, rv);
+    NS_ENSURE_SUCCESS(rv, nsnull);
 
-    rv = mApplicationCache->MarkEntry(cacheKey,
-                                      nsIApplicationCache::ITEM_FOREIGN);
+    return new OfflineCacheEntryAsForeignMarker(mApplicationCache, cacheKey);
+}
+
+nsresult
+nsHttpChannel::OfflineCacheEntryAsForeignMarker::MarkAsForeign()
+{
+    return mApplicationCache->MarkEntry(mCacheKey,
+                                        nsIApplicationCache::ITEM_FOREIGN);
+}
+
+NS_IMETHODIMP
+nsHttpChannel::MarkOfflineCacheEntryAsForeign()
+{
+    nsresult rv;
+
+    nsAutoPtr<OfflineCacheEntryAsForeignMarker> marker(
+        GetOfflineCacheEntryAsForeignMarker());
+
+    if (!marker)
+        return NS_ERROR_NOT_AVAILABLE;
+
+    rv = marker->MarkAsForeign();
     NS_ENSURE_SUCCESS(rv, rv);
 
     return NS_OK;
diff --git a/netwerk/protocol/http/nsHttpChannel.h b/netwerk/protocol/http/nsHttpChannel.h
index dbebc043c0e..941bda80ac9 100644
--- a/netwerk/protocol/http/nsHttpChannel.h
+++ b/netwerk/protocol/http/nsHttpChannel.h
@@ -161,6 +161,23 @@ public: /* internal necko use only */
         return NS_OK;
     }
 
+    // This allows cache entry to be marked as foreign even after channel itself
+    // is gone.  Needed for e10s (see HttpChannelParent::RecvDocumentChannelCleanup)
+    class OfflineCacheEntryAsForeignMarker {
+        nsCOMPtr<nsIApplicationCache> mApplicationCache;
+        nsCString mCacheKey;
+    public:
+        OfflineCacheEntryAsForeignMarker(nsIApplicationCache* appCache,
+                                         const nsCSubstring& key)
+             : mApplicationCache(appCache)
+             , mCacheKey(key)
+        {}
+
+        nsresult MarkAsForeign();
+    };
+
+    OfflineCacheEntryAsForeignMarker* GetOfflineCacheEntryAsForeignMarker();
+
 private:
     typedef nsresult (nsHttpChannel::*nsContinueRedirectionFunc)(nsresult result);