diff --git a/Objective-J/CFBundle.js b/Objective-J/CFBundle.js
index 54fd3b99c..db3f77190 100644
--- a/Objective-J/CFBundle.js
+++ b/Objective-J/CFBundle.js
@@ -352,8 +352,8 @@ function loadExecutableAndResources(/*Bundle*/ aBundle, /*BOOL*/ shouldExecute)
     if (!aBundle.mostEligibleEnvironment())
         return failure();
 
-    loadExecutableForBundle(aBundle, success, failure);
-    loadSpritedImagesForBundle(aBundle, success, failure);
+    loadExecutableForBundle(aBundle, success, failure, progress);
+    loadSpritedImagesForBundle(aBundle, success, failure, progress);
 
     if (aBundle._loadStatus === CFBundleLoading)
         return success();
@@ -373,14 +373,21 @@ function loadExecutableAndResources(/*Bundle*/ aBundle, /*BOOL*/ shouldExecute)
         finishBundleLoadingWithError(aBundle, anError || new Error("Could not recognize executable code format in Bundle " + aBundle));
     }
 
-    function success()
+    function progress(bytesLoaded)
     {
         if ((typeof CPApp === "undefined" || !CPApp || !CPApp._finishedLaunching) &&
-             typeof OBJJ_PROGRESS_CALLBACK === "function" && CPApplicationSizeInBytes)
+             typeof OBJJ_PROGRESS_CALLBACK === "function")
         {
-            OBJJ_PROGRESS_CALLBACK(MAX(MIN(1.0, CFTotalBytesLoaded / CPApplicationSizeInBytes), 0.0), CPApplicationSizeInBytes, aBundle.bundlePath());
-        }
+            CFTotalBytesLoaded += bytesLoaded;
 
+            var percent = CPApplicationSizeInBytes ? MAX(MIN(1.0, CFTotalBytesLoaded / CPApplicationSizeInBytes), 0.0) : 0;
+
+            OBJJ_PROGRESS_CALLBACK(percent, CPApplicationSizeInBytes, aBundle.bundlePath());
+        }
+    }
+
+    function success()
+    {
         if (aBundle._loadStatus === CFBundleLoading)
             aBundle._loadStatus = CFBundleLoaded;
         else
@@ -392,13 +399,13 @@ function loadExecutableAndResources(/*Bundle*/ aBundle, /*BOOL*/ shouldExecute)
 
         function complete()
         {
-
             aBundle._eventDispatcher.dispatchEvent(
             {
                 type:"load",
                 bundle:aBundle
             });
         }
+
         if (shouldExecute)
             executeBundle(aBundle, complete);
         else
@@ -406,7 +413,7 @@ function loadExecutableAndResources(/*Bundle*/ aBundle, /*BOOL*/ shouldExecute)
     }
 }
 
-function loadExecutableForBundle(/*Bundle*/ aBundle, success, failure)
+function loadExecutableForBundle(/*Bundle*/ aBundle, success, failure, progress)
 {
     var executableURL = aBundle.executableURL();
 
@@ -419,7 +426,6 @@ function loadExecutableForBundle(/*Bundle*/ aBundle, success, failure)
     {
         try
         {
-            CFTotalBytesLoaded += anEvent.request.responseText().length;
             decompileStaticFile(aBundle, anEvent.request.responseText(), executableURL);
             aBundle._loadStatus &= ~CFBundleLoadingExecutable;
             success();
@@ -428,7 +434,7 @@ function loadExecutableForBundle(/*Bundle*/ aBundle, success, failure)
         {
             failure(anException);
         }
-    }, failure);
+    }, failure, progress);
 }
 
 function spritedImagesTestURLStringForBundle(/*Bundle*/ aBundle)
@@ -448,7 +454,7 @@ function spritedImagesURLForBundle(/*Bundle*/ aBundle)
     return NULL;
 }
 
-function loadSpritedImagesForBundle(/*Bundle*/ aBundle, success, failure)
+function loadSpritedImagesForBundle(/*Bundle*/ aBundle, success, failure, progress)
 {
     if (!aBundle.hasSpritedImages())
         return;
@@ -458,7 +464,7 @@ function loadSpritedImagesForBundle(/*Bundle*/ aBundle, success, failure)
     if (!CFBundleHasTestedSpriteSupport())
         return CFBundleTestSpriteSupport(spritedImagesTestURLStringForBundle(aBundle), function()
         {
-            loadSpritedImagesForBundle(aBundle, success, failure);
+            loadSpritedImagesForBundle(aBundle, success, failure, progress);
         });
 
     var spritedImagesURL = spritedImagesURLForBundle(aBundle);
@@ -473,17 +479,15 @@ function loadSpritedImagesForBundle(/*Bundle*/ aBundle, success, failure)
     {
         try
         {
-            CFTotalBytesLoaded += anEvent.request.responseText().length;
             decompileStaticFile(aBundle, anEvent.request.responseText(), spritedImagesURL);
             aBundle._loadStatus &= ~CFBundleLoadingSpritedImages;
+            success();
         }
         catch(anException)
         {
             failure(anException);
         }
-
-        success();
-    }, failure);
+    }, failure, progress);
 }
 
 var CFBundleSpriteSupportListeners  = [],
diff --git a/Objective-J/CFHTTPRequest.js b/Objective-J/CFHTTPRequest.js
index 8be9e8b2f..ba98cc3a2 100644
--- a/Objective-J/CFHTTPRequest.js
+++ b/Objective-J/CFHTTPRequest.js
@@ -63,7 +63,11 @@ var NativeRequest = null;
 
 // We check ActiveXObject first, because we require local file access and
 // overrideMimeType feature (which the native XMLHttpRequest does not have in IE).
-if (window.ActiveXObject !== undefined)
+if (window.XMLHttpRequest)
+{
+    NativeRequest = window.XMLHttpRequest;
+}
+else if (window.ActiveXObject !== undefined)
 {
     // DON'T try 4.0 and 5.0: http://bit.ly/microsoft-msxml-explanation
     var MSXML_XMLHTTP_OBJECTS = ["Msxml2.XMLHTTP.3.0", "Msxml2.XMLHTTP.6.0"],
@@ -90,9 +94,6 @@ if (window.ActiveXObject !== undefined)
     }
 }
 
-if (!NativeRequest)
-    NativeRequest = window.XMLHttpRequest;
-
 GLOBAL(CFHTTPRequest) = function()
 {
     this._isOpen = false;
@@ -293,7 +294,7 @@ function determineAndDispatchHTTPRequestEvents(/*CFHTTPRequest*/ aRequest)
         eventDispatcher.dispatchEvent({ type:readyStates[aRequest.readyState()], request:aRequest});
 }
 
-function FileRequest(/*CFURL*/ aURL, onsuccess, onfailure)
+function FileRequest(/*CFURL*/ aURL, onsuccess, onfailure, onprogress)
 {
     var request = new CFHTTPRequest();
 
@@ -326,17 +327,60 @@ function FileRequest(/*CFURL*/ aURL, onsuccess, onfailure)
     }
 #endif
 
+    var loaded = 0,
+        progressHandler = null;
+
+    function progress(progressEvent)
+    {
+        onprogress(progressEvent.loaded - loaded);
+        loaded = progressEvent.loaded;
+    }
+
+    function success(anEvent)
+    {
+        // If the browser can't handle progress events,
+        // we need to send a progress message with the total
+        // size of the file when the file finishes loading.
+        if (onprogress && progressHandler === null)
+            onprogress(anEvent.request.responseText().length);
+
+        onsuccess(anEvent);
+    }
+
     if (exports.asyncLoader)
     {
-        request.onsuccess = Asynchronous(onsuccess);
+        request.onsuccess = Asynchronous(success);
         request.onfailure = Asynchronous(onfailure);
     }
     else
     {
-        request.onsuccess = onsuccess;
+        request.onsuccess = success;
         request.onfailure = onfailure;
     }
 
+    if (onprogress)
+    {
+        var supportsProgress = true;
+
+        // document.all means IE, window.atob is only supported by IE 10+
+        if (document.all)
+            supportsProgress = !!window.atob;
+
+        if (supportsProgress)
+        {
+            try
+            {
+                progressHandler = exports.asyncLoader ? Asynchronous(progress) : progress;
+                request._nativeRequest.onprogress = progressHandler;
+            }
+            catch (anException)
+            {
+                // Must be <= IE 9
+                progressHandler = null;
+            }
+        }
+    }
+
     request.open("GET", aURL.absoluteString(), exports.asyncLoader);
     request.send("");
 }