--- a/dom/bindings/Bindings.conf
+++ b/dom/bindings/Bindings.conf
@@ -318,17 +318,16 @@ DOMInterfaces = {
    'nativeType': 'mozilla::WebGLUniformLocation',
    'headerFile': 'WebGLContext.h',
    'wrapperCache': False
 },
 
 'XMLHttpRequest': [
 {
     'nativeType': 'nsXMLHttpRequest',
-    'prefable': True,
     'implicitJSContext': [ 'constructor', ],
     'resultNotAddRefed': [ 'upload', 'responseXML' ]
 },
 {
     'workers': True,
     'headerFile': 'mozilla/dom/workers/bindings/XMLHttpRequest.h',
 }],
 

--- a/js/xpconnect/src/dom_quickstubs.qsconf
+++ b/js/xpconnect/src/dom_quickstubs.qsconf
@@ -407,33 +407,16 @@ members = [
     'nsIBoxObject.screenX',
     'nsIBoxObject.screenY',
     'nsIBoxObject.width',
     'nsIBoxObject.height',
 
     # FileReader
     'nsIDOMFileReader.*',
     
-    # XHR
-    'nsIXMLHttpRequest.*',
-    # nsIXMLHttpRequest.channel is not used on the web, and more
-    # importantly relies on the CAPS check that quickstubs don't make.
-    '-nsIXMLHttpRequest.channel',
-    # various XHR things use ACString and AUTF8String and [cstring]
-    # which quickstubs don't handle as return values (or at all in the
-    # case of AUTF8String) yet.
-    '-nsIXMLHttpRequest.statusText',
-    '-nsIXMLHttpRequest.getAllResponseHeaders',
-    '-nsIXMLHttpRequest.getResponseHeader',
-    '-nsIXMLHttpRequest.setRequestHeader',
-    '-nsIXMLHttpRequest.overrideMimeType',
-    # nsIXMLHttpRequestUpload doesn't live in its own IDL file, so
-    # can't be quickstubbed
-    '-nsIXMLHttpRequest.upload',
-
     # Audio
     'nsIDOMNotifyAudioAvailableEvent.frameBuffer',
     'nsIDOMNotifyAudioAvailableEvent.time',
     'nsIDOMHTMLAudioElement.mozWriteAudio',
 
     # dom/indexedDB
     'nsIIDBCursor.*',
     'nsIIDBCursorWithValue.*',