diff --git a/dom/ipc/ContentChild.cpp b/dom/ipc/ContentChild.cpp
index 68ed58de00c4..f365dfed52e1 100644
--- a/dom/ipc/ContentChild.cpp
+++ b/dom/ipc/ContentChild.cpp
@@ -3305,11 +3305,8 @@ ContentChild::RecvFileCreationResponse(const nsID& aUUID,
   } else {
     MOZ_ASSERT(aResult.type() == FileCreationResult::TFileCreationSuccessResult);
 
-    PBlobChild* blobChild =
-      aResult.get_FileCreationSuccessResult().blobChild();
-    MOZ_ASSERT(blobChild);
-
-    RefPtr<BlobImpl> impl = static_cast<BlobChild*>(blobChild)->GetBlobImpl();
+    RefPtr<BlobImpl> impl =
+      IPCBlobUtils::Deserialize(aResult.get_FileCreationSuccessResult().blob());
     helper->ResponseReceived(impl, NS_OK);
   }
 
diff --git a/dom/ipc/ContentParent.cpp b/dom/ipc/ContentParent.cpp
index f1ece924c846..54778b936521 100644
--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -46,6 +46,7 @@
 #include "mozilla/dom/File.h"
 #include "mozilla/dom/FileCreatorHelper.h"
 #include "mozilla/dom/FileSystemSecurity.h"
+#include "mozilla/dom/IPCBlobUtils.h"
 #include "mozilla/dom/ExternalHelperAppParent.h"
 #include "mozilla/dom/GetFilesHelper.h"
 #include "mozilla/dom/GeolocationBinding.h"
@@ -5317,13 +5318,17 @@ ContentParent::RecvFileCreationRequest(const nsID& aID,
 
   MOZ_ASSERT(blobImpl);
 
-  BlobParent* blobParent = BlobParent::GetOrCreate(this, blobImpl);
-  if (NS_WARN_IF(!blobParent)) {
-    return IPC_FAIL_NO_REASON(this);
+  IPCBlob ipcBlob;
+  rv = IPCBlobUtils::Serialize(blobImpl, this, ipcBlob);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    if (!SendFileCreationResponse(aID, FileCreationErrorResult(rv))) {
+      return IPC_FAIL_NO_REASON(this);
+    }
+
+    return IPC_OK();
   }
 
-  if (!SendFileCreationResponse(aID,
-                                FileCreationSuccessResult(blobParent, nullptr))) {
+  if (!SendFileCreationResponse(aID, FileCreationSuccessResult(ipcBlob))) {
     return IPC_FAIL_NO_REASON(this);
   }
 
diff --git a/dom/ipc/PContent.ipdl b/dom/ipc/PContent.ipdl
index ac3d2dfb1c20..113e52e3e5c5 100644
--- a/dom/ipc/PContent.ipdl
+++ b/dom/ipc/PContent.ipdl
@@ -212,7 +212,7 @@ union GetFilesResponseResult
 
 struct FileCreationSuccessResult
 {
-  PBlob blob;
+  IPCBlob blob;
 };
 
 struct FileCreationErrorResult