hide plugins from Javascript in Firefox 46.0.1

diff --git a/dom/base/nsMimeTypeArray.cpp b/dom/base/nsMimeTypeArray.cpp
index 2e22076..044bf4e 100644
--- a/dom/base/nsMimeTypeArray.cpp
+++ b/dom/base/nsMimeTypeArray.cpp
@@ -192,6 +192,7 @@ nsMimeTypeArray::GetSupportedNames(unsigned, nsTArray< nsString >& aRetval)
 void
 nsMimeTypeArray::EnsurePluginMimeTypes()
 {
+  return;
   if (!mMimeTypes.IsEmpty() || !mWindow) {
     return;
   }
diff --git a/dom/base/nsPluginArray.cpp b/dom/base/nsPluginArray.cpp
index eba3127..cc51e91 100644
--- a/dom/base/nsPluginArray.cpp
+++ b/dom/base/nsPluginArray.cpp
@@ -288,6 +288,7 @@ operator<(const RefPtr<nsPluginElement>& lhs,
 void
 nsPluginArray::EnsurePlugins()
 {
+  return;
   if (!mPlugins.IsEmpty()) {
     // We already have an array of plugin elements.
     return;
@@ -454,6 +455,7 @@ nsPluginElement::MimeTypes()
 void
 nsPluginElement::EnsurePluginMimeTypes()
 {
+  return;
   if (!mMimeTypes.IsEmpty()) {
     return;
   }