diff --git a/dom/base/Navigator.cpp b/dom/base/Navigator.cpp
index 894e0a162e..d1af772ba3 100644
--- a/dom/base/Navigator.cpp
+++ b/dom/base/Navigator.cpp
@@ -40,6 +40,7 @@
 #include "mozilla/dom/ServiceWorkerContainer.h"
 #include "mozilla/dom/StorageManager.h"
 #include "mozilla/dom/TCPSocket.h"
+#include "mozilla/dom/URLSearchParams.h"
 #include "mozilla/dom/workers/RuntimeService.h"
 #include "mozilla/Hal.h"
 #include "nsISiteSpecificUserAgent.h"
@@ -877,12 +878,12 @@ Navigator::SendBeacon(const nsAString& aUrl,
   }
 
   if (aData.Value().IsBlob()) {
-    BodyExtractor<Blob> body(&aData.Value().GetAsBlob());
+    BodyExtractor<nsIXHRSendable> body(&aData.Value().GetAsBlob());
     return SendBeaconInternal(aUrl, &body, /* isBlob */ true, aRv);
   }
 
   if (aData.Value().IsFormData()) {
-    BodyExtractor<FormData> body(&aData.Value().GetAsFormData());
+    BodyExtractor<nsIXHRSendable> body(&aData.Value().GetAsFormData());
     return SendBeaconInternal(aUrl, &body, /* isBlob */ false, aRv);
   }
 
@@ -892,7 +893,7 @@ Navigator::SendBeacon(const nsAString& aUrl,
   }
 
   if (aData.Value().IsURLSearchParams()) {
-    BodyExtractor<URLSearchParams> body(&aData.Value().GetAsURLSearchParams());
+    BodyExtractor<nsIXHRSendable> body(&aData.Value().GetAsURLSearchParams());
     return SendBeaconInternal(aUrl, &body, /* isBlob */ false, aRv);
   }
 
diff --git a/dom/fetch/BodyExtractor.cpp b/dom/fetch/BodyExtractor.cpp
index 889526314e..89c9c20ddf 100644
--- a/dom/fetch/BodyExtractor.cpp
+++ b/dom/fetch/BodyExtractor.cpp
@@ -192,36 +192,6 @@ BodyExtractor<nsIInputStream>::GetAsStream(nsIInputStream** aResult,
   return NS_OK;
 }
 
-template<> nsresult
-BodyExtractor<Blob>::GetAsStream(nsIInputStream** aResult,
-                                 uint64_t* aContentLength,
-                                 nsACString& aContentTypeWithCharset,
-                                 nsACString& aCharset) const
-{
-  return mBody->GetSendInfo(aResult, aContentLength, aContentTypeWithCharset,
-                            aCharset);
-}
-
-template<> nsresult
-BodyExtractor<FormData>::GetAsStream(nsIInputStream** aResult,
-                                     uint64_t* aContentLength,
-                                     nsACString& aContentTypeWithCharset,
-                                     nsACString& aCharset) const
-{
-  return mBody->GetSendInfo(aResult, aContentLength, aContentTypeWithCharset,
-                            aCharset);
-}
-
-template<> nsresult
-BodyExtractor<URLSearchParams>::GetAsStream(nsIInputStream** aResult,
-                                            uint64_t* aContentLength,
-                                            nsACString& aContentTypeWithCharset,
-                                            nsACString& aCharset) const
-{
-  return mBody->GetSendInfo(aResult, aContentLength, aContentTypeWithCharset,
-                            aCharset);
-}
-
 template<> nsresult
 BodyExtractor<nsIXHRSendable>::GetAsStream(nsIInputStream** aResult,
                                            uint64_t* aContentLength,
diff --git a/dom/fetch/BodyExtractor.h b/dom/fetch/BodyExtractor.h
index 7d4bfd068e..d6b79b0349 100644
--- a/dom/fetch/BodyExtractor.h
+++ b/dom/fetch/BodyExtractor.h
@@ -24,8 +24,8 @@ public:
 };
 
 // The implementation versions of this template are:
-// ArrayBuffer, ArrayBufferView, Blob, FormData, nsAString, nsIDocument,
-// nsIInputStream, nsIXHRSendable, URLSearchParams
+// ArrayBuffer, ArrayBufferView, nsIXHRSendable (Blob, FormData,
+// URLSearchParams), nsAString, nsIDocument, nsIInputStream
 template<typename Type>
 class BodyExtractor final : public BodyExtractorBase
 {
diff --git a/dom/fetch/Fetch.cpp b/dom/fetch/Fetch.cpp
index de54b6094e..a831843a96 100644
--- a/dom/fetch/Fetch.cpp
+++ b/dom/fetch/Fetch.cpp
@@ -746,13 +746,13 @@ ExtractByteStreamFromBody(const OwningArrayBufferOrArrayBufferViewOrBlobOrFormDa
   }
   if (aBodyInit.IsBlob()) {
     Blob& blob = aBodyInit.GetAsBlob();
-    BodyExtractor<Blob> body(&blob);
+    BodyExtractor<nsIXHRSendable> body(&blob);
     return body.GetAsStream(aStream, &aContentLength, aContentTypeWithCharset,
                             charset);
   }
   if (aBodyInit.IsFormData()) {
     FormData& formData = aBodyInit.GetAsFormData();
-    BodyExtractor<FormData> body(&formData);
+    BodyExtractor<nsIXHRSendable> body(&formData);
     return body.GetAsStream(aStream, &aContentLength, aContentTypeWithCharset,
                             charset);
   }
@@ -763,7 +763,7 @@ ExtractByteStreamFromBody(const OwningArrayBufferOrArrayBufferViewOrBlobOrFormDa
   }
   if (aBodyInit.IsURLSearchParams()) {
     URLSearchParams& usp = aBodyInit.GetAsURLSearchParams();
-    BodyExtractor<URLSearchParams> body(&usp);
+    BodyExtractor<nsIXHRSendable> body(&usp);
     return body.GetAsStream(aStream, &aContentLength, aContentTypeWithCharset,
                             charset);
   }
@@ -795,14 +795,12 @@ ExtractByteStreamFromBody(const ArrayBufferOrArrayBufferViewOrBlobOrFormDataOrUS
                             charset);
   }
   if (aBodyInit.IsBlob()) {
-    Blob& blob = aBodyInit.GetAsBlob();
-    BodyExtractor<Blob> body(&blob);
+    BodyExtractor<nsIXHRSendable> body(&aBodyInit.GetAsBlob());
     return body.GetAsStream(aStream, &aContentLength, aContentTypeWithCharset,
                             charset);
   }
   if (aBodyInit.IsFormData()) {
-    FormData& formData = aBodyInit.GetAsFormData();
-    BodyExtractor<FormData> body(&formData);
+    BodyExtractor<nsIXHRSendable> body(&aBodyInit.GetAsFormData());
     return body.GetAsStream(aStream, &aContentLength, aContentTypeWithCharset,
                             charset);
   }
@@ -812,8 +810,7 @@ ExtractByteStreamFromBody(const ArrayBufferOrArrayBufferViewOrBlobOrFormDataOrUS
                             charset);
   }
   if (aBodyInit.IsURLSearchParams()) {
-    URLSearchParams& usp = aBodyInit.GetAsURLSearchParams();
-    BodyExtractor<URLSearchParams> body(&usp);
+    BodyExtractor<nsIXHRSendable> body(&aBodyInit.GetAsURLSearchParams());
     return body.GetAsStream(aStream, &aContentLength, aContentTypeWithCharset,
                             charset);
   }
diff --git a/dom/xhr/XMLHttpRequestMainThread.h b/dom/xhr/XMLHttpRequestMainThread.h
index ed02fd1da4..f2145605ef 100644
--- a/dom/xhr/XMLHttpRequestMainThread.h
+++ b/dom/xhr/XMLHttpRequestMainThread.h
@@ -36,6 +36,9 @@
 #include "mozilla/dom/MutableBlobStorage.h"
 #include "mozilla/dom/BodyExtractor.h"
 #include "mozilla/dom/TypedArray.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/FormData.h"
+#include "mozilla/dom/URLSearchParams.h"
 #include "mozilla/dom/XMLHttpRequest.h"
 #include "mozilla/dom/XMLHttpRequestBinding.h"
 #include "mozilla/dom/XMLHttpRequestEventTarget.h"
@@ -55,11 +58,8 @@ class nsIJSID;
 namespace mozilla {
 namespace dom {
 
-class Blob;
 class BlobSet;
 class DOMString;
-class FormData;
-class URLSearchParams;
 class XMLHttpRequestUpload;
 struct OriginAttributesDictionary;
 
@@ -325,14 +325,14 @@ public:
   virtual void
   Send(JSContext* /*aCx*/, Blob& aBlob, ErrorResult& aRv) override
   {
-    BodyExtractor<Blob> body(&aBlob);
+    BodyExtractor<nsIXHRSendable> body(&aBlob);
     aRv = SendInternal(&body);
   }
 
   virtual void Send(JSContext* /*aCx*/, URLSearchParams& aURLSearchParams,
                     ErrorResult& aRv) override
   {
-    BodyExtractor<URLSearchParams> body(&aURLSearchParams);
+    BodyExtractor<nsIXHRSendable> body(&aURLSearchParams);
     aRv = SendInternal(&body);
   }
 
@@ -357,7 +357,7 @@ public:
   virtual void
   Send(JSContext* /*aCx*/, FormData& aFormData, ErrorResult& aRv) override
   {
-    BodyExtractor<FormData> body(&aFormData);
+    BodyExtractor<nsIXHRSendable> body(&aFormData);
     aRv = SendInternal(&body);
   }