diff -r 000000000000 -r 6474c204b198 toolkit/components/statusfilter/nsBrowserStatusFilter.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/statusfilter/nsBrowserStatusFilter.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,78 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsBrowserStatusFilter_h__
+#define nsBrowserStatusFilter_h__
+
+#include "nsIWebProgressListener.h"
+#include "nsIWebProgressListener2.h"
+#include "nsIWebProgress.h"
+#include "nsWeakReference.h"
+#include "nsITimer.h"
+#include "nsCOMPtr.h"
+#include "nsString.h"
+
+//-----------------------------------------------------------------------------
+// nsBrowserStatusFilter - a web progress listener implementation designed to 
+// sit between nsDocLoader and nsBrowserStatusHandler to filter out and limit
+// the frequency of certain events to improve page load performance.
+//-----------------------------------------------------------------------------
+
+class nsBrowserStatusFilter : public nsIWebProgress
+                            , public nsIWebProgressListener2
+                            , public nsSupportsWeakReference
+{
+public:
+    nsBrowserStatusFilter();
+    virtual ~nsBrowserStatusFilter();
+
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIWEBPROGRESS
+    NS_DECL_NSIWEBPROGRESSLISTENER
+    NS_DECL_NSIWEBPROGRESSLISTENER2
+
+private:
+    nsresult StartDelayTimer();
+    void ProcessTimeout();
+    void MaybeSendProgress();
+    void MaybeSendStatus();
+    void ResetMembers();
+    bool DelayInEffect() { return mDelayedStatus || mDelayedProgress; }
+
+    static void TimeoutHandler(nsITimer *aTimer, void *aClosure);
+
+private:
+    nsCOMPtr<nsIWebProgressListener> mListener;
+    nsCOMPtr<nsITimer>               mTimer;
+
+    // delayed values
+    nsString                         mStatusMsg;
+    int64_t                          mCurProgress;
+    int64_t                          mMaxProgress;
+
+    nsString                         mCurrentStatusMsg;
+    bool                             mStatusIsDirty;
+    int32_t                          mCurrentPercentage;
+
+    // used to convert OnStart/OnStop notifications into progress notifications
+    int32_t                          mTotalRequests;
+    int32_t                          mFinishedRequests;
+    bool                             mUseRealProgressFlag;
+
+    // indicates whether a timeout is pending
+    bool                             mDelayedStatus;
+    bool                             mDelayedProgress;
+};
+
+#define NS_BROWSERSTATUSFILTER_CONTRACTID \
+    "@mozilla.org/appshell/component/browser-status-filter;1"
+#define NS_BROWSERSTATUSFILTER_CID                   \
+{ /* 6356aa16-7916-4215-a825-cbc2692ca87a */         \
+    0x6356aa16,                                      \
+    0x7916,                                          \
+    0x4215,                                          \
+    {0xa8, 0x25, 0xcb, 0xc2, 0x69, 0x2c, 0xa8, 0x7a} \
+}
+
+#endif // !nsBrowserStatusFilter_h__