diff --git a/dom/fetch/Fetch.cpp b/dom/fetch/Fetch.cpp
index 0d5f5178489d..135fa8d7c91f 100644
--- a/dom/fetch/Fetch.cpp
+++ b/dom/fetch/Fetch.cpp
@@ -1185,7 +1185,7 @@ nsresult ExtractByteStreamFromBody(const fetch::ResponseBodyInit& aBodyInit,
 
 template <class Derived>
 FetchBody<Derived>::FetchBody(nsIGlobalObject* aOwner)
-    : mOwner(aOwner), mReadableStreamReader(nullptr), mBodyUsed(false) {
+    : mOwner(aOwner), mBodyUsed(false) {
   MOZ_ASSERT(aOwner);
 
   if (!NS_IsMainThread()) {
@@ -1252,14 +1252,10 @@ void FetchBody<Derived>::SetBodyUsed(JSContext* aCx, ErrorResult& aRv) {
     } else {
       MOZ_ASSERT(mFetchStreamReader);
       //  Let's activate the FetchStreamReader.
-      RefPtr<ReadableStreamDefaultReader> reader;
-      mFetchStreamReader->StartConsuming(aCx, mReadableStreamBody,
-                                         getter_AddRefs(reader), aRv);
+      mFetchStreamReader->StartConsuming(aCx, mReadableStreamBody, aRv);
       if (NS_WARN_IF(aRv.Failed())) {
         return;
       }
-
-      mReadableStreamReader = reader.forget();
     }
   }
 }
@@ -1509,8 +1505,6 @@ void FetchBody<Derived>::LockStream(JSContext* aCx, ReadableStream* aStream,
   if (aRv.Failed()) {
     return;
   }
-
-  mReadableStreamReader = reader;
 }
 
 template void FetchBody<Request>::LockStream(JSContext* aCx,
@@ -1610,7 +1604,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(EmptyBody, FetchBody<EmptyBody>)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mAbortSignalImpl)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mFetchStreamReader)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mReadableStreamReader)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(EmptyBody,
@@ -1618,7 +1611,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(EmptyBody,
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAbortSignalImpl)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFetchStreamReader)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mReadableStreamReader)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(EmptyBody, FetchBody<EmptyBody>)
diff --git a/dom/fetch/Fetch.h b/dom/fetch/Fetch.h
index 0e2bfca4e5cb..2212a683254a 100644
--- a/dom/fetch/Fetch.h
+++ b/dom/fetch/Fetch.h
@@ -217,7 +217,6 @@ class FetchBody : public BodyStreamHolder, public AbortFollower {
 
   // This is the Reader used to retrieve data from the body. This needs to be
   // traversed by subclasses.
-  RefPtr<ReadableStreamDefaultReader> mReadableStreamReader;
   RefPtr<FetchStreamReader> mFetchStreamReader;
 
   explicit FetchBody(nsIGlobalObject* aOwner);
diff --git a/dom/fetch/FetchStreamReader.cpp b/dom/fetch/FetchStreamReader.cpp
index 57f09487fddb..74736d8056ee 100644
--- a/dom/fetch/FetchStreamReader.cpp
+++ b/dom/fetch/FetchStreamReader.cpp
@@ -173,7 +173,6 @@ void FetchStreamReader::CloseAndRelease(JSContext* aCx, nsresult aStatus) {
 
 // https://fetch.spec.whatwg.org/#body-incrementally-read
 void FetchStreamReader::StartConsuming(JSContext* aCx, ReadableStream* aStream,
-                                       ReadableStreamDefaultReader** aReader,
                                        ErrorResult& aRv) {
   MOZ_DIAGNOSTIC_ASSERT(!mReader);
   MOZ_DIAGNOSTIC_ASSERT(aStream);
@@ -186,7 +185,6 @@ void FetchStreamReader::StartConsuming(JSContext* aCx, ReadableStream* aStream,
   }
 
   mReader = reader;
-  reader.forget(aReader);
 
   mAsyncWaitWorkerRef = mWorkerRef;
   aRv = mPipeOut->AsyncWait(this, 0, 0, mOwningEventTarget);
diff --git a/dom/fetch/FetchStreamReader.h b/dom/fetch/FetchStreamReader.h
index 57956a3ced8b..65d94d8cb0e4 100644
--- a/dom/fetch/FetchStreamReader.h
+++ b/dom/fetch/FetchStreamReader.h
@@ -55,7 +55,7 @@ class FetchStreamReader final : public nsIOutputStreamCallback {
   void CloseAndRelease(JSContext* aCx, nsresult aStatus);
 
   void StartConsuming(JSContext* aCx, ReadableStream* aStream,
-                      ReadableStreamDefaultReader** aReader, ErrorResult& aRv);
+                      ErrorResult& aRv);
 
  private:
   explicit FetchStreamReader(nsIGlobalObject* aGlobal);
diff --git a/dom/fetch/Request.cpp b/dom/fetch/Request.cpp
index 405694611681..4fcb19b6f7b1 100644
--- a/dom/fetch/Request.cpp
+++ b/dom/fetch/Request.cpp
@@ -34,18 +34,18 @@ NS_IMPL_RELEASE_INHERITED(Request, FetchBody<Request>)
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(Request)
 
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(Request, FetchBody<Request>)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mReadableStreamReader)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mHeaders)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mSignal)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mFetchStreamReader)
   NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(Request, FetchBody<Request>)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mReadableStreamReader)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mHeaders)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSignal)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFetchStreamReader)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Request)
diff --git a/dom/fetch/Response.cpp b/dom/fetch/Response.cpp
index 0b842d1ef6dd..13904b56a6c1 100644
--- a/dom/fetch/Response.cpp
+++ b/dom/fetch/Response.cpp
@@ -42,7 +42,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(Response, FetchBody<Response>)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mHeaders)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mSignalImpl)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mFetchStreamReader)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mReadableStreamReader)
   NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
@@ -51,7 +50,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(Response, FetchBody<Response>)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mHeaders)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSignalImpl)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFetchStreamReader)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mReadableStreamReader)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(Response, FetchBody<Response>)