--- a/dom/plugins/ipc/PluginModuleParent.cpp
+++ b/dom/plugins/ipc/PluginModuleParent.cpp
@@ -607,17 +607,16 @@ PluginModuleParent::PluginModuleParent(b
     , mClearSiteDataSupported(false)
     , mGetSitesWithDataSupported(false)
     , mNPNIface(nullptr)
     , mNPPIface(nullptr)
     , mPlugin(nullptr)
     , mTaskFactory(this)
     , mSandboxLevel(0)
     , mIsFlashPlugin(false)
-    , mNPInitialized(false)
     , mIsNPShutdownPending(false)
     , mAsyncNewRv(NS_ERROR_NOT_INITIALIZED)
 #ifdef MOZ_CRASHREPORTER
     , mCrashReporterMutex("PluginModuleChromeParent::mCrashReporterMutex")
 #endif
 {
 }
 
@@ -2180,17 +2179,16 @@ PluginModuleChromeParent::NP_Initialize(
 
     if (*error != NPERR_NO_ERROR) {
         OnInitFailure();
         return NS_OK;
     }
 
     SetPluginFuncs(mNPPIface);
 
-    mNPInitialized = true;
     return NS_OK;
 }
 
 #else
 
 nsresult
 PluginModuleParent::NP_Initialize(NPNetscapeFuncs* bFuncs, NPError* error)
 {
@@ -2261,17 +2259,16 @@ PluginModuleChromeParent::NP_Initialize(
         return NS_ERROR_FAILURE;
     }
 
     if (*error != NPERR_NO_ERROR) {
         OnInitFailure();
         return NS_OK;
     }
 
-    mNPInitialized = true;
     return NS_OK;
 }
 
 #endif
 
 nsresult
 PluginModuleParent::NP_Shutdown(NPError* error)
 {

--- a/dom/plugins/ipc/PluginModuleParent.h
+++ b/dom/plugins/ipc/PluginModuleParent.h
@@ -91,19 +91,16 @@ protected:
 
     virtual bool
     DeallocPPluginInstanceParent(PPluginInstanceParent* aActor) override;
 
 public:
     explicit PluginModuleParent(bool aIsChrome);
     virtual ~PluginModuleParent();
 
-    /** @return whether this modules NP_Initialize has successfully completed
-        executing */
-    bool IsInitialized() const { return mNPInitialized; }
     bool IsChrome() const { return mIsChrome; }
 
     virtual void SetPlugin(nsNPAPIPlugin* plugin) override
     {
         mPlugin = plugin;
     }
 
     virtual void ActorDestroy(ActorDestroyReason why) override;
@@ -338,17 +335,16 @@ protected:
     // Dup of plugin's X socket, used to scope its resources to this
     // object instead of the plugin process's lifetime
     ScopedClose mPluginXSocketFdDup;
 #endif
 
     bool
     GetPluginDetails();
 
-    bool              mNPInitialized;
     bool              mIsNPShutdownPending;
     nsresult          mAsyncNewRv;
     uint32_t          mRunID;
 
     RefPtr<layers::TextureClientRecycleAllocator> mTextureAllocatorForDirectBitmap;
     RefPtr<layers::TextureClientRecycleAllocator> mTextureAllocatorForDXGISurface;
 
 #ifdef MOZ_CRASHREPORTER