diff --git a/dom/plugins/ipc/PluginModuleParent.cpp b/dom/plugins/ipc/PluginModuleParent.cpp
index de97daa75b49..aabc4ba5fc68 100644
--- a/dom/plugins/ipc/PluginModuleParent.cpp
+++ b/dom/plugins/ipc/PluginModuleParent.cpp
@@ -612,7 +612,6 @@ PluginModuleParent::PluginModuleParent(bool aIsChrome)
     , mTaskFactory(this)
     , mSandboxLevel(0)
     , mIsFlashPlugin(false)
-    , mNPInitialized(false)
     , mIsNPShutdownPending(false)
     , mAsyncNewRv(NS_ERROR_NOT_INITIALIZED)
 #ifdef MOZ_CRASHREPORTER
@@ -2185,7 +2184,6 @@ PluginModuleChromeParent::NP_Initialize(NPNetscapeFuncs* bFuncs, NPPluginFuncs*
 
     SetPluginFuncs(mNPPIface);
 
-    mNPInitialized = true;
     return NS_OK;
 }
 
@@ -2266,7 +2264,6 @@ PluginModuleChromeParent::NP_Initialize(NPNetscapeFuncs* bFuncs, NPError* error)
         return NS_OK;
     }
 
-    mNPInitialized = true;
     return NS_OK;
 }
 
diff --git a/dom/plugins/ipc/PluginModuleParent.h b/dom/plugins/ipc/PluginModuleParent.h
index ec593d7e705b..bb49453bd6e0 100644
--- a/dom/plugins/ipc/PluginModuleParent.h
+++ b/dom/plugins/ipc/PluginModuleParent.h
@@ -96,9 +96,6 @@ 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
@@ -343,7 +340,6 @@ protected:
     bool
     GetPluginDetails();
 
-    bool              mNPInitialized;
     bool              mIsNPShutdownPending;
     nsresult          mAsyncNewRv;
     uint32_t          mRunID;