diff --git a/browser/metro/base/content/browser.js b/browser/metro/base/content/browser.js
index 0382d4e9707b..cd4296d9ad8f 100644
--- a/browser/metro/base/content/browser.js
+++ b/browser/metro/base/content/browser.js
@@ -1477,9 +1477,6 @@ Tab.prototype = {
     // stop about:blank from loading
     browser.stop();
 
-    let fl = browser.QueryInterface(Ci.nsIFrameLoaderOwner).frameLoader;
-    fl.renderMode = Ci.nsIFrameLoader.RENDER_MODE_ASYNC_SCROLL;
-
     return browser;
   },
 
diff --git a/content/base/public/nsIFrameLoader.idl b/content/base/public/nsIFrameLoader.idl
index e3ed0363f3d4..beff6e1e66c8 100644
--- a/content/base/public/nsIFrameLoader.idl
+++ b/content/base/public/nsIFrameLoader.idl
@@ -16,7 +16,7 @@ interface nsIDOMElement;
 interface nsITabParent;
 interface nsILoadContext;
 
-[scriptable, builtinclass, uuid(55a772b8-855a-4c5f-b4a1-284b6b3bec28)]
+[scriptable, builtinclass, uuid(7600aa92-88dc-491c-896d-0564159b6a66)]
 interface nsIFrameLoader : nsISupports
 {
   /**
@@ -116,24 +116,6 @@ interface nsIFrameLoader : nsISupports
    */
   void requestNotifyAfterRemotePaint();
 
-  /** 
-   * The default rendering mode is synchronous scrolling.  In this
-   * mode, it's an error to try to set a target viewport.
-   */
-  const unsigned long RENDER_MODE_DEFAULT        = 0x00000000;
-
-  /**
-   * When asynchronous scrolling is enabled, a target viewport can be
-   * set to transform content pixels wrt its CSS viewport.
-   *
-   * NB: when async scrolling is enabled, it's the *user's*
-   * responsibility to update the target scroll offset.  In effect,
-   * the platform hands over control of scroll offset to the user.
-   */
-  const unsigned long RENDER_MODE_ASYNC_SCROLL   = 0x00000001;
-
-  attribute unsigned long renderMode;
-
   /**
    * The default event mode automatically forwards the events
    * handled in EventStateManager::HandleCrossProcessEvent to
diff --git a/content/base/src/nsFrameLoader.cpp b/content/base/src/nsFrameLoader.cpp
index 6589f87a949f..ec811a5341a7 100644
--- a/content/base/src/nsFrameLoader.cpp
+++ b/content/base/src/nsFrameLoader.cpp
@@ -171,7 +171,6 @@ nsFrameLoader::nsFrameLoader(Element* aOwner, bool aNetworkCreated)
   , mCurrentRemoteFrame(nullptr)
   , mRemoteBrowser(nullptr)
   , mChildID(0)
-  , mRenderMode(RENDER_MODE_DEFAULT)
   , mEventMode(EVENT_MODE_NORMAL_DISPATCH)
   , mPendingFrameSent(false)
 {
@@ -1952,24 +1951,6 @@ nsFrameLoader::UpdateBaseWindowPositionAndSize(nsSubDocumentFrame *aIFrame)
   return NS_OK;
 }
 
-NS_IMETHODIMP
-nsFrameLoader::GetRenderMode(uint32_t* aRenderMode)
-{
-  *aRenderMode = mRenderMode;
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsFrameLoader::SetRenderMode(uint32_t aRenderMode)
-{
-  if (aRenderMode == mRenderMode) {
-    return NS_OK;
-  }
-
-  mRenderMode = aRenderMode;
-  return NS_OK;
-}
-
 NS_IMETHODIMP
 nsFrameLoader::GetEventMode(uint32_t* aEventMode)
 {
diff --git a/content/base/src/nsFrameLoader.h b/content/base/src/nsFrameLoader.h
index f8a4fbe7e673..530b9af76d35 100644
--- a/content/base/src/nsFrameLoader.h
+++ b/content/base/src/nsFrameLoader.h
@@ -69,11 +69,6 @@ protected:
   ~nsFrameLoader();
 
 public:
-  bool AsyncScrollEnabled() const
-  {
-    return !!(mRenderMode & RENDER_MODE_ASYNC_SCROLL);
-  }
-
   static nsFrameLoader* Create(mozilla::dom::Element* aOwner,
                                bool aNetworkCreated);
 
@@ -367,11 +362,6 @@ private:
   TabParent* mRemoteBrowser;
   uint64_t mChildID;
 
-  // See nsIFrameLoader.idl.  Short story, if !(mRenderMode &
-  // RENDER_MODE_ASYNC_SCROLL), all the fields below are ignored in
-  // favor of what content tells.
-  uint32_t mRenderMode;
-
   // See nsIFrameLoader.idl. EVENT_MODE_NORMAL_DISPATCH automatically
   // forwards some input events to out-of-process content.
   uint32_t mEventMode;
diff --git a/layout/tools/reftest/reftest-content.js b/layout/tools/reftest/reftest-content.js
index 63acd8f43d4e..2c307e1bafca 100644
--- a/layout/tools/reftest/reftest-content.js
+++ b/layout/tools/reftest/reftest-content.js
@@ -227,7 +227,6 @@ function setupDisplayport(contentRootElement) {
     }
 
     if (contentRootElement.hasAttribute("reftest-async-scroll")) {
-        SendEnableAsyncScroll();
         setupDisplayportForElementSubtree(contentRootElement);
     } else {
         setupDisplayportForElement(contentRootElement);
@@ -865,11 +864,6 @@ function SendFailedNoPaint()
     sendAsyncMessage("reftest:FailedNoPaint");
 }
 
-function SendEnableAsyncScroll()
-{
-    sendAsyncMessage("reftest:EnableAsyncScroll");
-}
-
 // Return true if a snapshot was taken.
 function SendInitCanvasWithSnapshot()
 {
diff --git a/layout/tools/reftest/reftest.js b/layout/tools/reftest/reftest.js
index d8eb8ad7c39e..d89ec4a73b02 100644
--- a/layout/tools/reftest/reftest.js
+++ b/layout/tools/reftest/reftest.js
@@ -1780,7 +1780,6 @@ function FinishTestItem()
     gDumpLog("REFTEST INFO | Loading a blank page\n");
     // After clearing, content will notify us of the assertion count
     // and tests will continue.
-    SetAsyncScroll(false);
     SendClear();
     gFailedNoPaint = false;
 }
@@ -1910,21 +1909,10 @@ function RegisterMessageListenersAndLoadContentScript()
         "reftest:ExpectProcessCrash",
         function (m) { RecvExpectProcessCrash(); }
     );
-    gBrowserMessageManager.addMessageListener(
-        "reftest:EnableAsyncScroll",
-        function (m) { SetAsyncScroll(true); }
-    );
 
     gBrowserMessageManager.loadFrameScript("chrome://reftest/content/reftest-content.js", true, true);
 }
 
-function SetAsyncScroll(enabled)
-{
-    gBrowser.QueryInterface(CI.nsIFrameLoaderOwner).frameLoader.renderMode =
-        enabled ? CI.nsIFrameLoader.RENDER_MODE_ASYNC_SCROLL :
-                  CI.nsIFrameLoader.RENDER_MODE_DEFAULT;
-}
-
 function RecvAssertionCount(count)
 {
     DoAssertionCheck(count);
diff --git a/mobile/android/chrome/content/browser.js b/mobile/android/chrome/content/browser.js
index aef3d56b0a2f..379aa4a5ad74 100644
--- a/mobile/android/chrome/content/browser.js
+++ b/mobile/android/chrome/content/browser.js
@@ -3220,9 +3220,6 @@ Tab.prototype = {
 
     this.browser.stop();
 
-    let frameLoader = this.browser.QueryInterface(Ci.nsIFrameLoaderOwner).frameLoader;
-    frameLoader.renderMode = Ci.nsIFrameLoader.RENDER_MODE_ASYNC_SCROLL;
-
     // only set tab uri if uri is valid
     let uri = null;
     let title = aParams.title || aURL;