diff --git Source/core/dom/DOMImplementation.cpp Source/core/dom/DOMImplementation.cpp
index 2b04a24..85653cf 100644
--- Source/core/dom/DOMImplementation.cpp
+++ Source/core/dom/DOMImplementation.cpp
@@ -240,9 +240,9 @@ Document* DOMImplementation::createDocument(const String& type,
     // For that reason, the origin must be retrieved directly from init.url().
     if (init.frame()->isMainFrame()) {
       RefPtr<SecurityOrigin> origin = SecurityOrigin::create(init.url());
-      pluginData = init.frame()->page()->pluginData(origin.get());
+      pluginData = init.frame()->page()->pluginData(true, origin.get());
     } else {
-      pluginData = init.frame()->page()->pluginData(
+      pluginData = init.frame()->page()->pluginData(false,
           init.frame()->tree().top()->securityContext()->getSecurityOrigin());
     }
   }
diff --git Source/core/frame/LocalFrame.cpp Source/core/frame/LocalFrame.cpp
index 6fa75cf..20cba50 100644
--- Source/core/frame/LocalFrame.cpp
+++ Source/core/frame/LocalFrame.cpp
@@ -898,6 +898,7 @@ PluginData* LocalFrame::pluginData() const {
   if (!loader().allowPlugins(NotAboutToInstantiatePlugin))
     return nullptr;
   return page()->pluginData(
+      isMainFrame(),
       tree().top()->securityContext()->getSecurityOrigin());
 }
 
diff --git Source/core/page/Page.cpp Source/core/page/Page.cpp
index cb46ff7..7c63196 100644
--- Source/core/page/Page.cpp
+++ Source/core/page/Page.cpp
@@ -226,16 +226,26 @@ void Page::refreshPlugins() {
 
   for (const Page* page : allPages()) {
     // Clear out the page's plugin data.
-    if (page->m_pluginData)
-      page->m_pluginData = nullptr;
+    if (page->m_pluginDataMainFrame)
+      page->m_pluginDataMainFrame = nullptr;
+    if (page->m_pluginDataSubFrame)
+      page->m_pluginDataSubFrame = nullptr;
   }
 }
 
-PluginData* Page::pluginData(SecurityOrigin* mainFrameOrigin) const {
-  if (!m_pluginData ||
-      !mainFrameOrigin->isSameSchemeHostPort(m_pluginData->origin()))
-    m_pluginData = PluginData::create(mainFrameOrigin);
-  return m_pluginData.get();
+PluginData* Page::pluginData(bool isMainFrame,
+                             SecurityOrigin* mainFrameOrigin) const {
+  if (isMainFrame) {
+    if (!m_pluginDataMainFrame ||
+        !mainFrameOrigin->isSameSchemeHostPort(m_pluginDataMainFrame->origin()))
+      m_pluginDataMainFrame = PluginData::create(true, mainFrameOrigin);
+  } else {
+    if (!m_pluginDataSubFrame ||
+        !mainFrameOrigin->isSameSchemeHostPort(m_pluginDataSubFrame->origin()))
+      m_pluginDataSubFrame = PluginData::create(false, mainFrameOrigin);
+  }
+
+  return isMainFrame ? m_pluginDataMainFrame.get() : m_pluginDataSubFrame.get();
 }
 
 void Page::setValidationMessageClient(ValidationMessageClient* client) {
diff --git Source/core/page/Page.h Source/core/page/Page.h
index 9c429bd..667207e 100644
--- Source/core/page/Page.h
+++ Source/core/page/Page.h
@@ -130,7 +130,8 @@ class CORE_EXPORT Page final : public GarbageCollectedFinalized<Page>,
   ViewportDescription viewportDescription() const;
 
   static void refreshPlugins();
-  PluginData* pluginData(SecurityOrigin* mainFrameOrigin) const;
+  PluginData* pluginData(bool isMainFrame,
+                         SecurityOrigin* mainFrameOrigin) const;
 
   EditorClient& editorClient() const { return *m_editorClient; }
   SpellCheckerClient& spellCheckerClient() const {
@@ -285,7 +286,8 @@ class CORE_EXPORT Page final : public GarbageCollectedFinalized<Page>,
   // longer needed.
   Member<Frame> m_mainFrame;
 
-  mutable RefPtr<PluginData> m_pluginData;
+  mutable RefPtr<PluginData> m_pluginDataMainFrame;
+  mutable RefPtr<PluginData> m_pluginDataSubFrame;
 
   EditorClient* const m_editorClient;
   SpellCheckerClient* const m_spellCheckerClient;
diff --git Source/platform/plugins/PluginData.cpp Source/platform/plugins/PluginData.cpp
index a6da275..c879e64 100644
--- Source/platform/plugins/PluginData.cpp
+++ Source/platform/plugins/PluginData.cpp
@@ -30,11 +30,12 @@
 
 namespace blink {
 
-PluginData::PluginData(SecurityOrigin* mainFrameOrigin)
-    : m_mainFrameOrigin(mainFrameOrigin) {
+PluginData::PluginData(bool isMainFrame, SecurityOrigin* mainFrameOrigin)
+    : m_isMainFrame(isMainFrame),
+      m_mainFrameOrigin(mainFrameOrigin) {
   PluginListBuilder builder(&m_plugins);
   Platform::current()->getPluginList(
-      false, WebSecurityOrigin(m_mainFrameOrigin), &builder);
+      false, m_isMainFrame, WebSecurityOrigin(m_mainFrameOrigin), &builder);
 
   for (unsigned i = 0; i < m_plugins.size(); ++i) {
     const PluginInfo& plugin = m_plugins[i];
@@ -73,7 +74,8 @@ String PluginData::pluginNameForMimeType(const String& mimeType) const {
 void PluginData::refreshBrowserSidePluginCache() {
   Vector<PluginInfo> plugins;
   PluginListBuilder builder(&plugins);
-  Platform::current()->getPluginList(true, WebSecurityOrigin::createUnique(),
+  Platform::current()->getPluginList(true, true,
+                                     WebSecurityOrigin::createUnique(),
                                      &builder);
 }
 
diff --git Source/platform/plugins/PluginData.h Source/platform/plugins/PluginData.h
index 0edfd70..a81c128 100644
--- Source/platform/plugins/PluginData.h
+++ Source/platform/plugins/PluginData.h
@@ -52,8 +52,9 @@ class PLATFORM_EXPORT PluginData : public RefCounted<PluginData> {
   WTF_MAKE_NONCOPYABLE(PluginData);
 
  public:
-  static PassRefPtr<PluginData> create(SecurityOrigin* mainFrameOrigin) {
-    return adoptRef(new PluginData(mainFrameOrigin));
+  static PassRefPtr<PluginData> create(bool isMainFrame,
+                                       SecurityOrigin* mainFrameOrigin) {
+    return adoptRef(new PluginData(isMainFrame, mainFrameOrigin));
   }
 
   const Vector<PluginInfo>& plugins() const { return m_plugins; }
@@ -71,12 +72,13 @@ class PLATFORM_EXPORT PluginData : public RefCounted<PluginData> {
   static void refreshBrowserSidePluginCache();
 
  private:
-  explicit PluginData(SecurityOrigin* mainFrameOrigin);
+  explicit PluginData(bool isMainFrame, SecurityOrigin* mainFrameOrigin);
   const PluginInfo* pluginInfoForMimeType(const String& mimeType) const;
 
   Vector<PluginInfo> m_plugins;
   Vector<MimeClassInfo> m_mimes;
   Vector<size_t> m_mimePluginIndices;
+  bool m_isMainFrame;
   RefPtr<SecurityOrigin> m_mainFrameOrigin;
 };
 
diff --git public/platform/Platform.h public/platform/Platform.h
index 2cd7334..7541a5e 100644
--- public/platform/Platform.h
+++ public/platform/Platform.h
@@ -357,6 +357,7 @@ class BLINK_PLATFORM_EXPORT Platform {
   // satisfy this call. mainFrameOrigin is used by the browser process to
   // filter plugins from the plugin list based on content settings.
   virtual void getPluginList(bool refresh,
+                             bool isMainFrame,
                              const WebSecurityOrigin& mainFrameOrigin,
                              WebPluginListBuilder*) {}