4 files changed, 20 insertions, 5 deletions
diff --git a/dom/html/HTMLMenuElement.cpp b/dom/html/HTMLMenuElement.cpp
index 6c096084a..a099a5289 100644
--- a/dom/html/HTMLMenuElement.cpp
+++ b/dom/html/HTMLMenuElement.cpp
@@ -137,9 +137,9 @@ HTMLMenuElement::ParseAttribute(int32_t aNamespaceID,
                                 const nsAString& aValue,
                                 nsAttrValue& aResult)
 {
-  if (aNamespaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::type) {
-    bool success = aResult.ParseEnumValue(aValue, kMenuTypeTable,
-                                            false);
+  if (aNamespaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::type &&
+      Preferences::GetBool("dom.menuitem.enabled")) {
+    bool success = aResult.ParseEnumValue(aValue, kMenuTypeTable, false);
     if (success) {
       mType = aResult.GetEnumValue();
     } else {
diff --git a/dom/html/HTMLMenuItemElement.cpp b/dom/html/HTMLMenuItemElement.cpp
index 5c5cf8d76..6cf4eb40c 100644
--- a/dom/html/HTMLMenuItemElement.cpp
+++ b/dom/html/HTMLMenuItemElement.cpp
@@ -7,12 +7,22 @@
 
 #include "mozilla/BasicEvents.h"
 #include "mozilla/EventDispatcher.h"
+#include "mozilla/Preferences.h"
 #include "mozilla/dom/HTMLMenuItemElementBinding.h"
+#include "mozilla/dom/HTMLUnknownElement.h"
 #include "nsAttrValueInlines.h"
 #include "nsContentUtils.h"
 
-
-NS_IMPL_NS_NEW_HTML_ELEMENT_CHECK_PARSER(MenuItem)
+nsGenericHTMLElement*
+NS_NewHTMLMenuItemElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
+                          mozilla::dom::FromParser aFromParser) {
+  RefPtr<mozilla::dom::NodeInfo> nodeInfo(aNodeInfo);
+  if (mozilla::Preferences::GetBool("dom.menuitem.enabled")) {
+    return new mozilla::dom::HTMLMenuItemElement(nodeInfo.forget(), aFromParser);
+  } else {
+    return new mozilla::dom::HTMLUnknownElement(nodeInfo.forget());
+  }
+}
 
 namespace mozilla {
 namespace dom {
diff --git a/dom/html/test/browser_content_contextmenu_userinput.js b/dom/html/test/browser_content_contextmenu_userinput.js
index 7d0387715..845ba718e 100644
--- a/dom/html/test/browser_content_contextmenu_userinput.js
+++ b/dom/html/test/browser_content_contextmenu_userinput.js
@@ -4,6 +4,9 @@ const kPage = "http://example.org/browser/" +
               "dom/html/test/file_content_contextmenu.html";
 
 add_task(function* () {
+  yield SpecialPowers.pushPrefEnv({
+    set: [["dom.menuitem.enabled", true]],
+  });
   yield BrowserTestUtils.withNewTab({
     gBrowser,
     url: kPage
diff --git a/dom/html/test/mochitest.ini b/dom/html/test/mochitest.ini
index 5c9c66e61..dcbb73840 100644
--- a/dom/html/test/mochitest.ini
+++ b/dom/html/test/mochitest.ini
@@ -1,4 +1,6 @@
 [DEFAULT]
+prefs = 
+  dom.menuitem.enabled=true # only for test_bug617528.html
 support-files =
   347174transform.xsl
   347174transformable.xml