¯\_(ツ)_/¯

Inspired by: https://bugzilla.mozilla.org/show_bug.cgi?id=1663588

---
diff --git a/palemoon/installer/package-manifest.in b/palemoon/installer/package-manifest.in
index f4abb3500..8e23b3143 100644
--- a/palemoon/installer/package-manifest.in
+++ b/palemoon/installer/package-manifest.in
@@ -105,7 +105,6 @@
 #endif
 #ifdef MOZ_GTK3
 @BINPATH@/@DLL_PREFIX@mozgtk@DLL_SUFFIX@
-@BINPATH@/gtk2/@DLL_PREFIX@mozgtk@DLL_SUFFIX@
 #endif
 
 [browser]
diff --git a/platform/dom/moz.build b/platform/dom/moz.build
index e232f3443..2d1de20b3 100644
--- a/platform/dom/moz.build
+++ b/platform/dom/moz.build
@@ -113,6 +113,6 @@ TEST_DIRS += [
     'imptests',
 ]
 
-if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('gtk2', 'gtk3', 'cocoa', 'windows', 'android'):
+if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('gtk3', 'cocoa', 'windows', 'android'):
     TEST_DIRS += ['plugins/test']
 
diff --git a/platform/dom/plugins/base/moz.build b/platform/dom/plugins/base/moz.build
index d63ca51ce..8a14f24e1 100644
--- a/platform/dom/plugins/base/moz.build
+++ b/platform/dom/plugins/base/moz.build
@@ -28,7 +28,6 @@ EXPORTS += [
     'nsPluginInstanceOwner.h',
     'nsPluginLogging.h',
     'nsPluginNativeWindow.h',
-    'nsPluginNativeWindowGtk.h',
     'nsPluginsCID.h',
     'nsPluginsDir.h',
     'nsPluginTags.h',
@@ -64,17 +63,9 @@ elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa':
     ]
 else:
     SOURCES += [
+        'nsPluginNativeWindow.cpp',
         'nsPluginsDirUnix.cpp',
     ]
-    if 'gtk' in CONFIG['MOZ_WIDGET_TOOLKIT']:
-        # This file cannot be built in unified mode because of name clashes in X11 headers.
-        SOURCES += [
-            'nsPluginNativeWindowGtk.cpp',
-        ]
-    else:
-        SOURCES += [
-            'nsPluginNativeWindow.cpp',
-        ]
 
 LOCAL_INCLUDES += [
     '/dom/base',
diff --git a/platform/dom/plugins/base/npapi.h b/platform/dom/plugins/base/npapi.h
index e554aaabc..949679773 100644
--- a/platform/dom/plugins/base/npapi.h
+++ b/platform/dom/plugins/base/npapi.h
@@ -41,9 +41,9 @@
 #endif
 #endif
 
-#if defined(XP_UNIX)
-#include <stdio.h>
 #if defined(MOZ_X11)
+#include <stdio.h>
+#if 0
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #endif
@@ -220,7 +220,7 @@ typedef struct _NPAsyncSurface
 /* Exact meaning must be spec'd in event model. */
 #define kNPEventStartIME 2
 
-#if defined(XP_UNIX)
+#if 0
 /*
  * Unix specific structures and definitions
  */
@@ -243,7 +243,7 @@ typedef struct
 typedef struct
 {
   int32_t      type;
-#if defined(MOZ_X11)
+#if 0
   Display*     display;
   Visual*      visual;
   Colormap     colormap;
@@ -293,7 +293,7 @@ typedef enum {
 #if defined(XP_WIN)
   , NPDrawingModelSyncWin = 5
 #endif
-#if defined(MOZ_X11)
+#if 0
   , NPDrawingModelSyncX = 6
 #endif
   , NPDrawingModelAsyncBitmapSurface = 7
@@ -332,7 +332,7 @@ typedef enum {
  *   become a problem in the future when/if new plugins are compiled with 
  *   GCC, however.
  */
-#if (defined(XP_UNIX) && defined(__GNUC__) && (__GNUC__ >= 3) && !defined(XP_SOLARIS))
+#if 0
 #define _NP_ABI_MIXIN_FOR_GCC3 NP_ABI_GCC3_MASK
 #else
 #define _NP_ABI_MIXIN_FOR_GCC3 0
@@ -510,7 +510,7 @@ typedef struct _NPWindow
   uint32_t width;  /* Maximum window size */
   uint32_t height;
   NPRect   clipRect; /* Clipping rectangle in port coordinates */
-#if (defined(XP_UNIX) || defined(XP_SYMBIAN)) && !defined(XP_MACOSX)
+#if 0
   void * ws_info; /* Platform-dependent additional data */
 #endif /* XP_UNIX */
   NPWindowType type; /* Is this a window or a drawable? */
@@ -569,7 +569,7 @@ typedef struct _NPEvent
   uintptr_t wParam;
   uintptr_t lParam;
 } NPEvent;
-#elif defined(XP_UNIX) && defined(MOZ_X11)
+#elif 0
 typedef XEvent NPEvent;
 #else
 typedef void*  NPEvent;
@@ -583,7 +583,7 @@ typedef RgnHandle NPQDRegion;
 typedef CGPathRef NPCGRegion;
 #elif defined(XP_WIN)
 typedef HRGN NPRegion;
-#elif defined(XP_UNIX) && defined(MOZ_X11)
+#elif 0
 typedef Region NPRegion;
 #elif defined(XP_SYMBIAN)
 typedef QRegion* NPRegion;
@@ -816,7 +816,7 @@ extern "C" {
 
 /* NPP_* functions are provided by the plugin and called by the navigator. */
 
-#if defined(XP_UNIX)
+#if 0
 const char* NPP_GetMIMEDescription(void);
 #endif
 
diff --git a/platform/dom/plugins/base/nsNPAPIPlugin.cpp b/platform/dom/plugins/base/nsNPAPIPlugin.cpp
index da4f09914..90c9f2a83 100644
--- a/platform/dom/plugins/base/nsNPAPIPlugin.cpp
+++ b/platform/dom/plugins/base/nsNPAPIPlugin.cpp
@@ -56,7 +56,7 @@
 #endif
 
 // needed for nppdf plugin
-#if (MOZ_WIDGET_GTK)
+#if 0
 #include <gdk/gdk.h>
 #include <gdk/gdkx.h>
 #if (MOZ_WIDGET_GTK == 2)
@@ -85,7 +85,7 @@ using mozilla::PluginPRLibrary;
 using mozilla::plugins::PluginModuleChromeParent;
 using mozilla::plugins::PluginModuleContentParent;
 
-#ifdef MOZ_X11
+#if 0
 #include "mozilla/X11Util.h"
 #endif
 
@@ -1729,9 +1729,9 @@ _getvalue(NPP npp, NPNVariable variable, void *result)
   // cases for android_npapi.h's non-standard ANPInterface values.
   switch (static_cast<int>(variable)) {
 
-#if defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
   case NPNVxDisplay : {
-#if defined(MOZ_X11)
+#if 0
     if (npp) {
       nsNPAPIPluginInstance *inst = (nsNPAPIPluginInstance *) npp->ndata;
       bool windowless = false;
@@ -1777,7 +1777,7 @@ _getvalue(NPP npp, NPNVariable variable, void *result)
     return NPERR_GENERIC_ERROR;
 #endif
 
-#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
+#if 0
   case NPNVnetscapeWindow: {
     if (!npp || !npp->ndata)
       return NPERR_INVALID_INSTANCE_ERROR;
@@ -1822,7 +1822,7 @@ _getvalue(NPP npp, NPNVariable variable, void *result)
   }
 
   case NPNVToolkit: {
-#ifdef MOZ_WIDGET_GTK
+#if 0
     *((NPNToolkitType*)result) = NPNVGtk2;
 #endif
 
@@ -1833,7 +1833,7 @@ _getvalue(NPP npp, NPNVariable variable, void *result)
   }
 
   case NPNVSupportsXEmbedBool: {
-#ifdef MOZ_WIDGET_GTK
+#if 0
     *(NPBool*)result = true;
 #else
     *(NPBool*)result = false;
@@ -1854,8 +1854,7 @@ _getvalue(NPP npp, NPNVariable variable, void *result)
   }
 
   case NPNVSupportsWindowless: {
-#if defined(XP_WIN) || defined(XP_MACOSX) || \
-    (defined(MOZ_X11) && defined(MOZ_WIDGET_GTK))
+#if defined(XP_WIN) || defined(XP_MACOSX)
     *(NPBool*)result = true;
 #else
     *(NPBool*)result = false;
diff --git a/platform/dom/plugins/base/nsNPAPIPluginInstance.cpp b/platform/dom/plugins/base/nsNPAPIPluginInstance.cpp
index 7ee71c8f7..8de8c40d7 100644
--- a/platform/dom/plugins/base/nsNPAPIPluginInstance.cpp
+++ b/platform/dom/plugins/base/nsNPAPIPluginInstance.cpp
@@ -362,7 +362,7 @@ nsresult nsNPAPIPluginInstance::SetWindow(NPWindow* window)
   if (!window || RUNNING != mRunning)
     return NS_OK;
 
-#if MOZ_WIDGET_GTK
+#if 0
   // bug 108347, flash plugin on linux doesn't like window->width <=
   // 0, but Java needs wants this call.
   if (window && window->type == NPWindowTypeWindow &&
diff --git a/platform/dom/plugins/base/nsNPAPIPluginInstance.h b/platform/dom/plugins/base/nsNPAPIPluginInstance.h
index 48e62517d..eda61db4e 100644
--- a/platform/dom/plugins/base/nsNPAPIPluginInstance.h
+++ b/platform/dom/plugins/base/nsNPAPIPluginInstance.h
@@ -32,7 +32,7 @@ class nsPluginInstanceOwner;
 
 #if defined(OS_WIN)
 const NPDrawingModel kDefaultDrawingModel = NPDrawingModelSyncWin;
-#elif defined(MOZ_X11)
+#elif 0
 const NPDrawingModel kDefaultDrawingModel = NPDrawingModelSyncX;
 #elif defined(XP_MACOSX)
 #ifndef NP_NO_QUICKDRAW
diff --git a/platform/dom/plugins/base/nsPluginInstanceOwner.cpp b/platform/dom/plugins/base/nsPluginInstanceOwner.cpp
index 0d4dc68cc..df23790e0 100644
--- a/platform/dom/plugins/base/nsPluginInstanceOwner.cpp
+++ b/platform/dom/plugins/base/nsPluginInstanceOwner.cpp
@@ -4,7 +4,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#ifdef MOZ_X11
+#if 0
 #include <cairo-xlib.h>
 #include "gfxXlibSurface.h"
 /* X headers suck */
@@ -83,7 +83,7 @@ static NS_DEFINE_CID(kAppShellCID, NS_APPSHELL_CID);
 #include "nsIDOMXULCommandDispatcher.h"
 #endif
 
-#ifdef MOZ_WIDGET_GTK
+#if 0
 #include <gdk/gdk.h>
 #include <gtk/gtk.h>
 #endif
@@ -322,7 +322,7 @@ nsPluginInstanceOwner::~nsPluginInstanceOwner()
 
   mPluginFrame = nullptr;
 
-  PLUG_DeletePluginNativeWindow(mPluginWindow);
+  //PLUG_DeletePluginNativeWindow(mPluginWindow);
   mPluginWindow = nullptr;
 
   if (mInstance) {
@@ -679,7 +679,7 @@ NS_IMETHODIMP nsPluginInstanceOwner::GetNetscapeWindow(void *value)
   }
 
   return NS_OK;
-#elif defined(MOZ_WIDGET_GTK) && defined(MOZ_X11)
+#elif 0
   // X11 window managers want the toplevel window for WM_TRANSIENT_FOR.
   nsIWidget* win = mPluginFrame->GetNearestWidget();
   if (!win)
@@ -1836,7 +1836,7 @@ nsPluginInstanceOwner::HandleEvent(nsIDOMEvent* aEvent)
   return NS_OK;
 }
 
-#ifdef MOZ_X11
+#if 0
 static unsigned int XInputEventState(const WidgetInputEvent& anEvent)
 {
   unsigned int state = 0;
@@ -2317,7 +2317,7 @@ nsEventStatus nsPluginInstanceOwner::ProcessEvent(const WidgetGUIEvent& anEvent)
   }
 #endif
 
-#ifdef MOZ_X11
+#if 0
   // this code supports windowless plugins
   nsIWidget* widget = anEvent.mWidget;
   XEvent pluginEvent = XEvent();
@@ -2349,7 +2349,7 @@ nsEventStatus nsPluginInstanceOwner::ProcessEvent(const WidgetGUIEvent& anEvent)
         if (widget) {
           rootPoint = anEvent.mRefPoint + widget->WidgetToScreenOffset();
         }
-#ifdef MOZ_WIDGET_GTK
+#if 0
         Window root = GDK_ROOT_WINDOW();
 #else
         Window root = X11None; // Could XQueryTree, but this is not important.
@@ -2436,7 +2436,7 @@ nsEventStatus nsPluginInstanceOwner::ProcessEvent(const WidgetGUIEvent& anEvent)
       if (anEvent.mPluginEvent)
         {
           XKeyEvent &event = pluginEvent.xkey;
-#ifdef MOZ_WIDGET_GTK
+#if 0
           event.root = GDK_ROOT_WINDOW();
           event.time = anEvent.mTime;
           const GdkEventKey* gdkEvent =
@@ -2632,7 +2632,7 @@ void nsPluginInstanceOwner::Paint(const RECT& aDirty, HDC aDC)
 }
 #endif
 
-#if defined(MOZ_X11)
+#if 0
 void nsPluginInstanceOwner::Paint(gfxContext* aContext,
                                   const gfxRect& aFrameRect,
                                   const gfxRect& aDirtyRect)
@@ -2777,7 +2777,7 @@ nsPluginInstanceOwner::Renderer::DrawWithXlib(cairo_surface_t* xsurface,
 
   NPSetWindowCallbackStruct* ws_info =
     static_cast<NPSetWindowCallbackStruct*>(mWindow->ws_info);
-#ifdef MOZ_X11
+#if 0
   if (ws_info->visual != visual || ws_info->colormap != colormap) {
     ws_info->visual = visual;
     ws_info->colormap = colormap;
@@ -2996,7 +2996,7 @@ NS_IMETHODIMP nsPluginInstanceOwner::CreateWidget(void)
     // passing HDC till paint event when it is really
     // needed. Change spec?
     mPluginWindow->window = nullptr;
-#ifdef MOZ_X11
+#if 0
     // Fill in the display field.
     NPSetWindowCallbackStruct* ws_info =
     static_cast<NPSetWindowCallbackStruct*>(mPluginWindow->ws_info);
diff --git a/platform/dom/plugins/base/nsPluginInstanceOwner.h b/platform/dom/plugins/base/nsPluginInstanceOwner.h
index 2fa67c86e..5246da985 100644
--- a/platform/dom/plugins/base/nsPluginInstanceOwner.h
+++ b/platform/dom/plugins/base/nsPluginInstanceOwner.h
@@ -29,7 +29,7 @@ class nsPluginDOMContextMenuListener;
 class nsPluginFrame;
 class nsDisplayListBuilder;
 
-#ifdef MOZ_X11
+#if 0
 class gfxContext;
 #endif
 
@@ -45,7 +45,7 @@ class PuppetWidget;
 
 using mozilla::widget::PuppetWidget;
 
-#ifdef MOZ_X11
+#if 0
 #include "gfxXlibNativeRenderer.h"
 #endif
 
@@ -108,7 +108,7 @@ public:
   void Paint(const gfxRect& aDirtyRect, CGContextRef cgContext);  
   void RenderCoreAnimation(CGContextRef aCGContext, int aWidth, int aHeight);
   void DoCocoaEventDrawRect(const gfxRect& aDrawRect, CGContextRef cgContext);
-#elif defined(MOZ_X11)
+#elif 0
   void Paint(gfxContext* aContext,
              const gfxRect& aFrameRect,
              const gfxRect& aDirtyRect);
@@ -191,7 +191,7 @@ public:
     return "";
   }
   
-#ifdef MOZ_X11
+#if 0
   void GetPluginDescription(nsACString& aDescription)
   {
     aDescription.Truncate();
@@ -214,7 +214,7 @@ public:
     return mPluginWindow->type == NPWindowTypeDrawable &&
     (MatchPluginName("Shockwave Flash") ||
      MatchPluginName("Test Plug-in"));
-#elif defined(MOZ_X11) || defined(XP_MACOSX)
+#elif defined(XP_MACOSX)
     return true;
 #else
     return false;
@@ -328,7 +328,7 @@ private:
   uint32_t                    mLastEventloopNestingLevel;
   bool                        mContentFocused;
   bool                        mWidgetVisible;    // used on Mac to store our widget's visible state
-#ifdef MOZ_X11
+#if 0
   // Used with windowless plugins only, initialized in CreateWidget().
   bool                        mFlash10Quirks;
 #endif
@@ -369,7 +369,7 @@ private:
 
   int mLastMouseDownButtonType;
 
-#ifdef MOZ_X11
+#if 0
   class Renderer : public gfxXlibNativeRenderer
   {
   public:
diff --git a/platform/dom/plugins/base/nsPluginNativeWindow.cpp b/platform/dom/plugins/base/nsPluginNativeWindow.cpp
index f9baf5b81..175f42ca4 100644
--- a/platform/dom/plugins/base/nsPluginNativeWindow.cpp
+++ b/platform/dom/plugins/base/nsPluginNativeWindow.cpp
@@ -27,7 +27,7 @@ nsPluginNativeWindowPLATFORM::nsPluginNativeWindowPLATFORM() : nsPluginNativeWin
   width = 0; 
   height = 0; 
   memset(&clipRect, 0, sizeof(clipRect));
-#if defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
   ws_info = nullptr;
 #endif
   type = NPWindowTypeWindow;
diff --git a/platform/dom/plugins/ipc/NPEventUnix.h b/platform/dom/plugins/ipc/NPEventUnix.h
index 4cc9a5456..5474ba467 100644
--- a/platform/dom/plugins/ipc/NPEventUnix.h
+++ b/platform/dom/plugins/ipc/NPEventUnix.h
@@ -9,7 +9,7 @@
 
 #include "npapi.h"
 
-#ifdef MOZ_X11
+#if 0
 #include "mozilla/X11Util.h"
 #endif
 
@@ -61,7 +61,7 @@ struct ParamTraits<mozilla::plugins::NPRemoteEvent>     // synonym for XEvent
             return false;
         }
 
-#ifdef MOZ_X11
+#if 0
         SetXDisplay(aResult->event);
 #endif
         return true;
@@ -73,7 +73,7 @@ struct ParamTraits<mozilla::plugins::NPRemoteEvent>     // synonym for XEvent
         aLog->append(L"(XEvent)");
     }
 
-#ifdef MOZ_X11
+#if 0
 private:
     static void SetXDisplay(XEvent& ev)
     {
diff --git a/platform/dom/plugins/ipc/PluginInstanceChild.cpp b/platform/dom/plugins/ipc/PluginInstanceChild.cpp
index a4f6b6b51..8b2dc7de1 100644
--- a/platform/dom/plugins/ipc/PluginInstanceChild.cpp
+++ b/platform/dom/plugins/ipc/PluginInstanceChild.cpp
@@ -16,7 +16,7 @@
 #include "gfx2DGlue.h"
 #include "nsNPAPIPluginInstance.h"
 #include "mozilla/gfx/2D.h"
-#ifdef MOZ_X11
+#if 0
 #include "gfxXlibSurface.h"
 #endif
 #ifdef XP_WIN
@@ -47,7 +47,7 @@ using namespace mozilla::gfx;
 using namespace mozilla::widget;
 using namespace std;
 
-#ifdef MOZ_WIDGET_GTK
+#if 0
 
 #include <gtk/gtk.h>
 #include <gdk/gdkx.h>
@@ -152,7 +152,7 @@ PluginInstanceChild::PluginInstanceChild(const NPPluginFuncs* aPluginIface,
     , mAsyncInvalidateTask(0)
     , mCachedWindowActor(nullptr)
     , mCachedElementActor(nullptr)
-#ifdef MOZ_WIDGET_GTK
+#if 0
     , mXEmbed(false)
 #endif // MOZ_WIDGET_GTK
 #if defined(OS_WIN)
@@ -198,10 +198,10 @@ PluginInstanceChild::PluginInstanceChild(const NPPluginFuncs* aPluginIface,
     mWindow.type = NPWindowTypeWindow;
     mData.ndata = (void*) this;
     mData.pdata = nullptr;
-#if defined(MOZ_X11) && defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
     mWindow.ws_info = &mWsInfo;
     memset(&mWsInfo, 0, sizeof(mWsInfo));
-#ifdef MOZ_WIDGET_GTK
+#if 1
     mWsInfo.display = nullptr;
     mXtClient.top_widget = nullptr;
 #else
@@ -391,7 +391,7 @@ PluginInstanceChild::NPN_GetValue(NPNVariable aVar,
 
     switch(aVar) {
 
-#if defined(MOZ_X11)
+#if 0
     case NPNVToolkit:
         *((NPNToolkitType*)aValue) = NPNVGtk2;
         return NPERR_NO_ERROR;
@@ -462,7 +462,7 @@ PluginInstanceChild::NPN_GetValue(NPNVariable aVar,
             *static_cast<HWND*>(aValue) = mPluginWindowHWND;
             return NPERR_NO_ERROR;
         }
-#elif defined(MOZ_X11)
+#elif 0
         NPError result;
         CallNPN_GetValue_NPNVnetscapeWindow(static_cast<XID*>(aValue), &result);
         return result;
@@ -610,7 +610,7 @@ PluginInstanceChild::NPN_SetValue(NPPVariable aVar, void* aValue)
             return NPERR_GENERIC_ERROR;
 
         NPWindowType newWindowType = windowed ? NPWindowTypeWindow : NPWindowTypeDrawable;
-#ifdef MOZ_WIDGET_GTK
+#if 0
         if (mWindow.type != newWindowType && mWsInfo.display) {
            // plugin type has been changed but we already have a valid display
            // so update it for the recent plugin mode
@@ -901,7 +901,7 @@ PluginInstanceChild::AnswerNPP_HandleEvent(const NPRemoteEvent& event,
     AssertPluginThread();
     AutoStackHelper guard(this);
 
-#if defined(MOZ_X11) && defined(DEBUG)
+#if 0
     if (GraphicsExpose == event.event.type)
         PLUGIN_LOG_DEBUG(("  received drawable 0x%lx\n",
                           event.event.xgraphicsexpose.drawable));
@@ -959,7 +959,7 @@ PluginInstanceChild::AnswerNPP_HandleEvent(const NPRemoteEvent& event,
     }
 #endif
 
-#ifdef MOZ_X11
+#if 0
     if (GraphicsExpose == event.event.type) {
         // Make sure the X server completes the drawing before the parent
         // draws on top and destroys the Drawable.
@@ -1202,7 +1202,7 @@ bool PluginInstanceChild::CreateWindow(const NPRemoteWindow& aWindow)
                       aWindow.x, aWindow.y,
                       aWindow.width, aWindow.height));
 
-#ifdef MOZ_WIDGET_GTK
+#if 0
     if (mXEmbed) {
         mWindow.window = reinterpret_cast<void*>(aWindow.window);
     }
@@ -1231,7 +1231,7 @@ void PluginInstanceChild::DeleteWindow()
   if (!mWindow.window)
       return;
 
-#ifdef MOZ_WIDGET_GTK
+#if 0
   if (mXtClient.top_widget) {     
       xt_client_unrealize(&mXtClient);
       xt_client_destroy(&mXtClient); 
@@ -1290,7 +1290,7 @@ PluginInstanceChild::AnswerNPP_SetWindow(const NPRemoteWindow& aWindow)
     AssertPluginThread();
     AutoStackHelper guard(this);
 
-#if defined(MOZ_X11) && defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
     NS_ASSERTION(mWsInfo.display, "We should have a valid display!");
 
     // The minimum info is sent over IPC to allow this
@@ -1430,7 +1430,7 @@ PluginInstanceChild::AnswerNPP_SetWindow(const NPRemoteWindow& aWindow)
 #elif defined(MOZ_WIDGET_UIKIT)
     // Don't care
 #else
-#  error Implement me for your OS
+//#  error Implement me for your OS
 #endif
 
     return true;
@@ -1439,7 +1439,7 @@ PluginInstanceChild::AnswerNPP_SetWindow(const NPRemoteWindow& aWindow)
 bool
 PluginInstanceChild::Initialize()
 {
-#ifdef MOZ_WIDGET_GTK
+#if 0
     NPError rv;
 
     if (mWsInfo.display) {
@@ -3406,7 +3406,7 @@ PluginInstanceChild::CreateOptSurface(void)
         (mIsTransparent && !mBackground) ? SurfaceFormat::A8R8G8B8_UINT32 :
                                            SurfaceFormat::X8R8G8B8_UINT32;
 
-#ifdef MOZ_X11
+#if 0
     Display* dpy = mWsInfo.display;
     Screen* screen = DefaultScreenOfDisplay(dpy);
     if (format == SurfaceFormat::X8R8G8B8_UINT32 &&
@@ -3466,7 +3466,7 @@ PluginInstanceChild::MaybeCreatePlatformHelperSurface(void)
         return false;
     }
 
-#ifdef MOZ_X11
+#if 0
     bool supportNonDefaultVisual = false;
     Screen* screen = DefaultScreenOfDisplay(mWsInfo.display);
     Visual* defaultVisual = DefaultVisualOfScreen(screen);
@@ -3625,11 +3625,11 @@ PluginInstanceChild::EnsureCurrentBuffer(void)
 void
 PluginInstanceChild::UpdateWindowAttributes(bool aForceSetWindow)
 {
-#if defined(MOZ_X11) || defined(XP_WIN)
+#if 0
     RefPtr<gfxASurface> curSurface = mHelperSurface ? mHelperSurface : mCurrentSurface;
 #endif // Only used within MOZ_X11 or XP_WIN blocks. Unused variable otherwise
     bool needWindowUpdate = aForceSetWindow;
-#ifdef MOZ_X11
+#if 0
     Visual* visual = nullptr;
     Colormap colormap = 0;
     if (curSurface && curSurface->GetType() == gfxSurfaceType::Xlib) {
@@ -3725,7 +3725,7 @@ PluginInstanceChild::PaintRectToPlatformSurface(const nsIntRect& aRect,
     // We should not send an async surface if we're using direct rendering.
     MOZ_ASSERT(!IsUsingDirectDrawing());
 
-#ifdef MOZ_X11
+#if 0
     {
         NS_ASSERTION(aSurface->GetType() == gfxSurfaceType::Xlib,
                      "Non supported platform surface type");
@@ -3782,7 +3782,7 @@ PluginInstanceChild::PaintRectToSurface(const nsIntRect& aRect,
     // Render using temporary X surface, with copy to image surface
     nsIntRect plPaintRect(aRect);
     RefPtr<gfxASurface> renderSurface = aSurface;
-#ifdef MOZ_X11
+#if 0
     if (mIsTransparent && (GetQuirks() & QUIRK_FLASH_EXPOSE_COORD_TRANSLATION)) {
         // Work around a bug in Flash up to 10.1 d51 at least, where expose event
         // top left coordinates within the plugin-rect and not at the drawable
@@ -4131,7 +4131,7 @@ PluginInstanceChild::ShowPluginFrame()
     NPRect r = { (uint16_t)rect.y, (uint16_t)rect.x,
                  (uint16_t)rect.YMost(), (uint16_t)rect.XMost() };
     SurfaceDescriptor currSurf;
-#ifdef MOZ_X11
+#if 0
     if (mCurrentSurface->GetType() == gfxSurfaceType::Xlib) {
         gfxXlibSurface *xsurf = static_cast<gfxXlibSurface*>(mCurrentSurface.get());
         currSurf = SurfaceDescriptorX11(xsurf);
@@ -4183,7 +4183,7 @@ PluginInstanceChild::ReadbackDifferenceRect(const nsIntRect& rect)
 
     // We can read safely from XSurface,SharedDIBSurface and Unsafe SharedMemory,
     // because PluginHost is not able to modify that surface
-#if defined(MOZ_X11)
+#if 0
     if (mBackSurface->GetType() != gfxSurfaceType::Xlib &&
         !gfxSharedImageSurface::IsSharedImage(mBackSurface))
         return false;
@@ -4192,7 +4192,7 @@ PluginInstanceChild::ReadbackDifferenceRect(const nsIntRect& rect)
         return false;
 #endif
 
-#if defined(MOZ_X11) || defined(XP_WIN)
+#if 0
     if (mCurrentSurface->GetContentType() != mBackSurface->GetContentType())
         return false;
 
@@ -4310,7 +4310,7 @@ PluginInstanceChild::RecvUpdateBackground(const SurfaceDescriptor& aBackground,
     if (!mBackground) {
         // XXX refactor me
         switch (aBackground.type()) {
-#ifdef MOZ_X11
+#if 0
         case SurfaceDescriptor::TSurfaceDescriptorX11: {
             mBackground = aBackground.get_SurfaceDescriptorX11().OpenForeign();
             break;
@@ -4650,7 +4650,7 @@ PluginInstanceChild::Destroy()
 
     mPendingAsyncCalls.Clear();
     
-#ifdef MOZ_WIDGET_GTK
+#if 0
     if (mWindow.type == NPWindowTypeWindow && !mXEmbed) {
       xt_client_xloop_destroy();
     }
diff --git a/platform/dom/plugins/ipc/PluginInstanceChild.h b/platform/dom/plugins/ipc/PluginInstanceChild.h
index 0ad6e145d..ecec92960 100644
--- a/platform/dom/plugins/ipc/PluginInstanceChild.h
+++ b/platform/dom/plugins/ipc/PluginInstanceChild.h
@@ -35,7 +35,7 @@
 
 #include <map>
 
-#ifdef MOZ_WIDGET_GTK
+#if 0
 #include "gtk2xtbin.h"
 #endif
 
@@ -456,7 +456,7 @@ private:
     PluginScriptableObjectChild* mCachedWindowActor;
     PluginScriptableObjectChild* mCachedElementActor;
 
-#if defined(MOZ_X11) && defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
     NPSetWindowCallbackStruct mWsInfo;
 #ifdef MOZ_WIDGET_GTK
     bool mXEmbed;
diff --git a/platform/dom/plugins/ipc/PluginInstanceParent.cpp b/platform/dom/plugins/ipc/PluginInstanceParent.cpp
index 523dc5c80..93d1f8c9e 100644
--- a/platform/dom/plugins/ipc/PluginInstanceParent.cpp
+++ b/platform/dom/plugins/ipc/PluginInstanceParent.cpp
@@ -29,7 +29,7 @@
 #include "nsPluginInstanceOwner.h"
 #include "nsFocusManager.h"
 #include "nsIDOMElement.h"
-#ifdef MOZ_X11
+#if 0
 #include "gfxXlibSurface.h"
 #endif
 #include "gfxContext.h"
@@ -64,7 +64,7 @@
 #include "nsPluginNativeWindow.h"
 #include "PluginQuirks.h"
 extern const wchar_t* kFlashFullscreenClass;
-#elif defined(MOZ_WIDGET_GTK)
+#elif 0
 #include "mozilla/dom/ContentChild.h"
 #include <gdk/gdk.h>
 #elif defined(XP_MACOSX)
@@ -196,7 +196,7 @@ PluginInstanceParent::ActorDestroy(ActorDestroyReason why)
         if (mImageContainer) {
             mImageContainer->ClearAllImages();
         }
-#ifdef MOZ_X11
+#if 0
         FinishX(DefaultXDisplay());
 #endif
     }
@@ -266,7 +266,7 @@ PluginInstanceParent::AnswerNPN_GetValue_NPNVnetscapeWindow(NativeWindowHandle*
 #ifdef XP_WIN
     HWND id;
 #elif defined(MOZ_X11)
-    XID id;
+    int id;
 #elif defined(XP_DARWIN)
     intptr_t id;
 #else
@@ -472,7 +472,7 @@ PluginInstanceParent::AnswerNPN_SetValue_NPPVpluginDrawingModel(
         case NPDrawingModelAsyncWindowsDXGISurface:
             allowed = AllowDirectDXGISurfaceDrawing();
             break;
-#elif defined(MOZ_X11)
+#elif 0
         case NPDrawingModelSyncX:
             allowed = true;
             break;
@@ -906,7 +906,7 @@ PluginInstanceParent::RecvShow(const NPRect& updatedRect,
         return true;
     }
 #endif
-#ifdef MOZ_X11
+#if 0
     else if (newSurface.type() == SurfaceDescriptor::TSurfaceDescriptorX11) {
         surface = newSurface.get_SurfaceDescriptorX11().OpenForeign();
     }
@@ -923,7 +923,7 @@ PluginInstanceParent::RecvShow(const NPRect& updatedRect,
         // This is the "old front buffer" we're about to hand back to
         // the plugin.  We might still have drawing operations
         // referencing it.
-#ifdef MOZ_X11
+#if 0
         if (mFrontSurface->GetType() == gfxSurfaceType::Xlib) {
             // Finish with the surface and XSync here to ensure the server has
             // finished operations on the surface before the plugin starts
@@ -1166,7 +1166,7 @@ PluginInstanceParent::EndUpdateBackground(const nsIntRect& aRect)
         ("[InstanceParent][%p] EndUpdateBackground for <x=%d,y=%d, w=%d,h=%d>",
          this, aRect.x, aRect.y, aRect.width, aRect.height));
 
-#ifdef MOZ_X11
+#if 0
     // Have to XSync here to avoid the plugin trying to draw with this
     // surface racing with its creation in the X server.  We also want
     // to avoid the plugin drawing onto stale pixels, then handing us
@@ -1223,7 +1223,7 @@ PluginInstanceParent::CreateBackground(const nsIntSize& aSize)
 
     // XXX refactor me
 
-#if defined(MOZ_X11)
+#if 0
     Screen* screen = DefaultScreenOfDisplay(DefaultXDisplay());
     Visual* visual = DefaultVisualOfScreen(screen);
     mBackground = gfxXlibSurface::Create(screen, visual,
@@ -1268,7 +1268,7 @@ PluginInstanceParent::BackgroundDescriptor()
 
     // XXX refactor me
 
-#ifdef MOZ_X11
+#if 0
     gfxXlibSurface* xsurf = static_cast<gfxXlibSurface*>(mBackground.get());
     return SurfaceDescriptorX11(xsurf);
 #endif
@@ -1395,7 +1395,7 @@ PluginInstanceParent::NPP_SetWindow(const NPWindow* aWindow)
     }
 #endif
 
-#if defined(MOZ_X11) && defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
     const NPSetWindowCallbackStruct* ws_info =
       static_cast<NPSetWindowCallbackStruct*>(aWindow->ws_info);
     window.visualID = ws_info->visual ? ws_info->visual->visualid : 0;
@@ -1612,7 +1612,7 @@ PluginInstanceParent::NPP_HandleEvent(void* event)
     }
 #endif
 
-#if defined(MOZ_X11)
+#if 0
     switch (npevent->type) {
     case GraphicsExpose:
         PLUGIN_LOG_DEBUG(("  schlepping drawable 0x%lx across the pipe\n",
@@ -1632,7 +1632,7 @@ PluginInstanceParent::NPP_HandleEvent(void* event)
         // Release any active pointer grab so that the plugin X client can
         // grab the pointer if it wishes.
         Display *dpy = DefaultXDisplay();
-#  ifdef MOZ_WIDGET_GTK
+#  if 0
         // GDK attempts to (asynchronously) track whether there is an active
         // grab so ungrab through GDK.
         //
diff --git a/platform/dom/plugins/ipc/PluginMessageUtils.cpp b/platform/dom/plugins/ipc/PluginMessageUtils.cpp
index 5b1d1667f..3dcdcfd82 100644
--- a/platform/dom/plugins/ipc/PluginMessageUtils.cpp
+++ b/platform/dom/plugins/ipc/PluginMessageUtils.cpp
@@ -50,7 +50,7 @@ namespace plugins {
 
 NPRemoteWindow::NPRemoteWindow() :
   window(0), x(0), y(0), width(0), height(0), type(NPWindowTypeDrawable)
-#if defined(MOZ_X11) && defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
   , visualID(0)
   , colormap(0)
 #endif /* XP_UNIX */
@@ -82,7 +82,7 @@ MediateRace(const MessageChannel::MessageInfo& parent,
   }
 }
 
-#if defined(OS_LINUX) || defined(OS_SOLARIS)
+#if defined(OS_SOLARIS)
 static string
 ReplaceAll(const string& haystack, const string& needle, const string& with)
 {
@@ -101,7 +101,7 @@ ReplaceAll(const string& haystack, const string& needle, const string& with)
 string
 MungePluginDsoPath(const string& path)
 {
-#if defined(OS_LINUX) || defined(OS_SOLARIS)
+#if defined(OS_SOLARIS)
   // https://bugzilla.mozilla.org/show_bug.cgi?id=519601
   return ReplaceAll(path, "netscape", "netsc@pe");
 #else
@@ -112,7 +112,7 @@ MungePluginDsoPath(const string& path)
 string
 UnmungePluginDsoPath(const string& munged)
 {
-#if defined(OS_LINUX) || defined(OS_SOLARIS)
+#if defined(OS_SOLARIS)
   return ReplaceAll(munged, "netsc@pe", "netscape");
 #else
   return munged;
diff --git a/platform/dom/plugins/ipc/PluginMessageUtils.h b/platform/dom/plugins/ipc/PluginMessageUtils.h
index a9cd52ae2..484a92ec5 100644
--- a/platform/dom/plugins/ipc/PluginMessageUtils.h
+++ b/platform/dom/plugins/ipc/PluginMessageUtils.h
@@ -87,7 +87,7 @@ struct NPRemoteWindow
   uint32_t height;
   NPRect clipRect;
   NPWindowType type;
-#if defined(MOZ_X11) && defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
   VisualID visualID;
   Colormap colormap;
 #endif /* XP_UNIX */
@@ -109,9 +109,9 @@ struct NPAudioDeviceChangeDetailsIPC
 
 #ifdef XP_WIN
 typedef HWND NativeWindowHandle;
-#elif defined(MOZ_X11)
+#elif 0
 typedef XID NativeWindowHandle;
-#elif defined(XP_DARWIN)
+#elif defined(XP_DARWIN) || defined(MOZ_X11)
 typedef intptr_t NativeWindowHandle; // never actually used, will always be 0
 #else
 #error Need NativeWindowHandle for this platform
@@ -357,7 +357,7 @@ struct ParamTraits<mozilla::plugins::NPRemoteWindow>
     WriteParam(aMsg, aParam.height);
     WriteParam(aMsg, aParam.clipRect);
     WriteParam(aMsg, aParam.type);
-#if defined(MOZ_X11) && defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
     aMsg->WriteULong(aParam.visualID);
     aMsg->WriteULong(aParam.colormap);
 #endif
@@ -382,7 +382,7 @@ struct ParamTraits<mozilla::plugins::NPRemoteWindow>
           ReadParam(aMsg, aIter, &type)))
       return false;
 
-#if defined(MOZ_X11) && defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
     unsigned long visualID;
     unsigned long colormap;
     if (!(aMsg->ReadULong(aIter, &visualID) &&
@@ -403,7 +403,7 @@ struct ParamTraits<mozilla::plugins::NPRemoteWindow>
     aResult->height = height;
     aResult->clipRect = clipRect;
     aResult->type = type;
-#if defined(MOZ_X11) && defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
     aResult->visualID = visualID;
     aResult->colormap = colormap;
 #endif
diff --git a/platform/dom/plugins/ipc/PluginModuleChild.cpp b/platform/dom/plugins/ipc/PluginModuleChild.cpp
index 98c9cd494..2ba887e4f 100644
--- a/platform/dom/plugins/ipc/PluginModuleChild.cpp
+++ b/platform/dom/plugins/ipc/PluginModuleChild.cpp
@@ -11,7 +11,7 @@
 
 #include "mozilla/ipc/MessageChannel.h"
 
-#ifdef MOZ_WIDGET_GTK
+#if 0
 #include <gtk/gtk.h>
 #endif
 
@@ -23,7 +23,7 @@
 #include "nsPluginsDir.h"
 #include "nsXULAppAPI.h"
 
-#ifdef MOZ_X11
+#if 0
 # include "nsX11ErrorHandler.h"
 # include "mozilla/X11Util.h"
 #endif
@@ -119,7 +119,7 @@ PluginModuleChild::PluginModuleChild(bool aIsChrome)
   , mInitializeFunc(0)
 #if defined(OS_WIN) || defined(OS_MACOSX)
   , mGetEntryPointsFunc(0)
-#elif defined(MOZ_WIDGET_GTK)
+#elif 0
   , mNestedLoopTimerId(0)
 #endif
 #ifdef OS_WIN
@@ -255,7 +255,7 @@ PluginModuleChild::InitForChrome(const std::string& aPluginFilename,
     // XXX quirks isn't initialized yet
     mAsyncRenderSupport = info.fSupportsAsyncRender;
 #endif
-#if defined(MOZ_X11)
+#if 0
     NS_NAMED_LITERAL_CSTRING(flash10Head, "Shockwave Flash 10.");
     if (StringBeginsWith(nsDependentCString(info.fDescription), flash10Head)) {
         AddQuirk(QUIRK_FLASH_EXPOSE_COORD_TRANSLATION);
@@ -268,7 +268,7 @@ PluginModuleChild::InitForChrome(const std::string& aPluginFilename,
     mozilla::plugins::PluginUtilsOSX::SetProcessName(nameBuffer);
 #endif
     pluginFile.FreePluginInfo(info);
-#if defined(MOZ_X11) || defined(XP_MACOSX)
+#if 0
     if (!mLibrary)
 #endif
     {
@@ -316,7 +316,7 @@ PluginModuleChild::InitForChrome(const std::string& aPluginFilename,
     return true;
 }
 
-#if defined(MOZ_WIDGET_GTK)
+#if 0
 
 typedef void (*GObjectDisposeFn)(GObject*);
 typedef gboolean (*GtkWidgetScrollEventFn)(GtkWidget*, GdkEventScroll*);
@@ -565,7 +565,7 @@ PluginModuleChild::ShouldContinueFromReplyTimeout()
 bool
 PluginModuleChild::InitGraphics()
 {
-#if defined(MOZ_WIDGET_GTK)
+#if 0
     // Work around plugins that don't interact well with GDK
     // client-side windows.
     PR_SetEnv("GDK_NATIVE_WINDOWS=1");
@@ -604,7 +604,7 @@ PluginModuleChild::InitGraphics()
 #else
     // may not be necessary on all platforms
 #endif
-#ifdef MOZ_X11
+#if 0
     // Do this after initializing GDK, or GDK will install its own handler.
     InstallX11ErrorHandler();
 #endif
@@ -614,7 +614,7 @@ PluginModuleChild::InitGraphics()
 void
 PluginModuleChild::DeinitGraphics()
 {
-#if defined(MOZ_X11) && defined(NS_FREE_PERMANENT_DATA)
+#if 0
     // We free some data off of XDisplay close hooks, ensure they're
     // run.  Closing the display is pretty scary, so we only do it to
     // silence leak checkers.
@@ -1073,7 +1073,7 @@ _getvalue(NPP aNPP,
     switch (aVariable) {
         // Copied from nsNPAPIPlugin.cpp
         case NPNVToolkit:
-#if defined(MOZ_WIDGET_GTK)
+#if 0
             *static_cast<NPNToolkitType*>(aValue) = NPNVGtk2;
             return NPERR_NO_ERROR;
 #endif
@@ -1094,7 +1094,7 @@ _getvalue(NPP aNPP,
         case NPNVSupportsWindowless:
             *(NPBool*)aValue = PluginModuleChild::GetChrome()->Settings().supportsWindowless();
             return NPERR_NO_ERROR;
-#if defined(MOZ_WIDGET_GTK)
+#if 0
         case NPNVxDisplay: {
             if (aNPP) {
                 return InstCast(aNPP)->NPN_GetValue(aVariable, aValue);
@@ -1858,7 +1858,7 @@ PluginModuleChild::DoNP_Initialize(const PluginSettings& aSettings)
     SetEventHooks();
 #endif
 
-#ifdef MOZ_X11
+#if 0
     // Send the parent our X socket to act as a proxy reference for our X
     // resources.
     int xSocketFd = ConnectionNumber(DefaultXDisplay());
diff --git a/platform/dom/plugins/ipc/PluginModuleChild.h b/platform/dom/plugins/ipc/PluginModuleChild.h
index 5e4fa7d20..7fa04a9fe 100644
--- a/platform/dom/plugins/ipc/PluginModuleChild.h
+++ b/platform/dom/plugins/ipc/PluginModuleChild.h
@@ -240,7 +240,7 @@ private:
     void HookProtectedMode();
 #endif
 
-#if defined(MOZ_WIDGET_GTK)
+#if 0
     static gboolean DetectNestedEventLoop(gpointer data);
     static gboolean ProcessBrowserEvents(gpointer data);
 
@@ -269,7 +269,7 @@ private:
 
     PluginSettings mCachedSettings;
 
-#if defined(MOZ_WIDGET_GTK)
+#if 0
     // If a plugin spins a nested glib event loop in response to a
     // synchronous IPC message from the browser, the loop might break
     // only after the browser responds to a request sent by the
diff --git a/platform/dom/plugins/ipc/PluginModuleParent.cpp b/platform/dom/plugins/ipc/PluginModuleParent.cpp
index 6ea205ef0..479bf49a9 100755
--- a/platform/dom/plugins/ipc/PluginModuleParent.cpp
+++ b/platform/dom/plugins/ipc/PluginModuleParent.cpp
@@ -46,7 +46,7 @@
 #include "PluginUtilsWin.h"
 #endif
 
-#ifdef MOZ_WIDGET_GTK
+#if 0
 #include <glib.h>
 #elif XP_MACOSX
 #include "PluginInterposeOSX.h"
@@ -1432,7 +1432,7 @@ PluginModuleChromeParent::AnswerNPN_SetValue_NPPVpluginRequiresAudioDeviceChange
 bool
 PluginModuleParent::RecvBackUpXResources(const FileDescriptor& aXSocketFd)
 {
-#ifndef MOZ_X11
+#if 1
     NS_RUNTIMEABORT("This message only makes sense on X11 platforms");
 #else
     MOZ_ASSERT(0 > mPluginXSocketFdDup.get(),
@@ -1692,7 +1692,7 @@ PluginModuleChromeParent::CachedSettingChanged(const char* aPref, void* aModule)
     module->CachedSettingChanged();
 }
 
-#if defined(XP_UNIX) && !defined(XP_MACOSX)
+#if 0
 nsresult
 PluginModuleParent::NP_Initialize(NPNetscapeFuncs* bFuncs, NPPluginFuncs* pFuncs, NPError* error)
 {
@@ -1775,6 +1775,23 @@ PluginModuleChromeParent::NP_Initialize(NPNetscapeFuncs* bFuncs, NPPluginFuncs*
 
     return NS_OK;
 }
+#endif
+
+#if defined(XP_UNIX) && !defined(XP_MACOSX)
+nsresult PluginModuleParent::NP_Initialize(NPNetscapeFuncs* bFuncs,
+                                           NPPluginFuncs* pFuncs,
+                                           NPError* error) {
+    *error = NPERR_GENERIC_ERROR;
+    return NS_ERROR_FAILURE;
+}
+
+nsresult PluginModuleChromeParent::NP_Initialize(NPNetscapeFuncs* bFuncs,
+                                                 NPPluginFuncs* pFuncs,
+                                                 NPError* error) {
+    *error = NPERR_GENERIC_ERROR;
+    return NS_ERROR_FAILURE;
+}
+
 
 bool
 PluginModuleParent::RecvNP_InitializeResult(const NPError& aError)
@@ -2356,7 +2373,7 @@ PluginModuleParent::AnswerProcessSomeEvents()
     return true;
 }
 
-#elif !defined(MOZ_WIDGET_GTK)
+#elif 1
 bool
 PluginModuleParent::AnswerProcessSomeEvents()
 {
diff --git a/platform/dom/plugins/ipc/PluginModuleParent.h b/platform/dom/plugins/ipc/PluginModuleParent.h
index 909e8fe35..267fcfc11 100644
--- a/platform/dom/plugins/ipc/PluginModuleParent.h
+++ b/platform/dom/plugins/ipc/PluginModuleParent.h
@@ -318,7 +318,7 @@ protected:
     int32_t mSandboxLevel;
     bool mIsFlashPlugin;
 
-#ifdef MOZ_X11
+#if 0
     // Dup of plugin's X socket, used to scope its resources to this
     // object instead of the plugin process's lifetime
     ScopedClose mPluginXSocketFdDup;
diff --git a/platform/dom/plugins/ipc/PluginWidgetParent.cpp b/platform/dom/plugins/ipc/PluginWidgetParent.cpp
index 3c9a95b52..11dcee76e 100644
--- a/platform/dom/plugins/ipc/PluginWidgetParent.cpp
+++ b/platform/dom/plugins/ipc/PluginWidgetParent.cpp
@@ -12,7 +12,7 @@
 #include "mozilla/DebugOnly.h"
 #include "nsDebug.h"
 
-#if defined(MOZ_WIDGET_GTK)
+#if 0
 #include "nsPluginNativeWindowGtk.h"
 #endif
 
@@ -95,7 +95,7 @@ PluginWidgetParent::RecvCreate(nsresult* aResult, uint64_t* aScrollCaptureId,
   mWidget = do_CreateInstance(kWidgetCID, aResult);
   NS_ASSERTION(NS_SUCCEEDED(*aResult), "widget create failure");
 
-#if defined(MOZ_WIDGET_GTK)
+#if 0
   // We need this currently just for GTK in setting up a socket widget
   // we can send over to content -> plugin.
   PLUG_NewPluginNativeWindow((nsPluginNativeWindow**)&mWrapper);
@@ -132,7 +132,7 @@ PluginWidgetParent::RecvCreate(nsresult* aResult, uint64_t* aScrollCaptureId,
 
   mWidget->EnableDragDrop(true);
 
-#if defined(MOZ_WIDGET_GTK)
+#if 0
   // For setup, initially GTK code expects 'window' to hold the parent.
   mWrapper->window = mWidget->GetNativeData(NS_NATIVE_PLUGIN_PORT);
   DebugOnly<nsresult> drv = mWrapper->CreateXEmbedWindow(false);
@@ -167,7 +167,7 @@ PluginWidgetParent::KillWidget()
   if (mWidget) {
     mWidget->UnregisterPluginWindowForRemoteUpdates();
     mWidget->Destroy();
-#if defined(MOZ_WIDGET_GTK)
+#if 0
     mWidget->SetNativeData(NS_NATIVE_PLUGIN_OBJECT_PTR, (uintptr_t)0);
     mWrapper = nullptr;
 #elif defined(XP_WIN)
@@ -207,7 +207,7 @@ bool
 PluginWidgetParent::RecvGetNativePluginPort(uintptr_t* value)
 {
   ENSURE_CHANNEL;
-#if defined(MOZ_WIDGET_GTK)
+#if 0
   *value = (uintptr_t)mWrapper->window;
   NS_ASSERTION(*value, "no xid??");
 #else
diff --git a/platform/dom/plugins/ipc/moz.build b/platform/dom/plugins/ipc/moz.build
index 182a11562..6c95ac119 100644
--- a/platform/dom/plugins/ipc/moz.build
+++ b/platform/dom/plugins/ipc/moz.build
@@ -123,9 +123,6 @@ DEFINES['FORCE_PR_LOG'] = True
 
 if CONFIG['MOZ_WIDGET_TOOLKIT'] != 'gtk3':
     CXXFLAGS += CONFIG['TK_CFLAGS']
-else:
-    # Force build against gtk+2 for struct offsets and such.
-    CXXFLAGS += CONFIG['MOZ_GTK2_CFLAGS']
 
 CXXFLAGS += CONFIG['MOZ_CAIRO_CFLAGS']
 
diff --git a/platform/dom/plugins/test/moz.build b/platform/dom/plugins/test/moz.build
index c7f7b01ed..024c0fab8 100644
--- a/platform/dom/plugins/test/moz.build
+++ b/platform/dom/plugins/test/moz.build
@@ -8,7 +8,7 @@ DIRS += ['testplugin', 'testaddon']
 
 XPCSHELL_TESTS_MANIFESTS += ['unit/xpcshell.ini']
 
-if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('gtk2', 'gtk3', 'cocoa', 'windows'):
+if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('cocoa', 'windows'):
     MOCHITEST_MANIFESTS += ['mochitest/mochitest.ini']
     MOCHITEST_CHROME_MANIFESTS += ['mochitest/chrome.ini']
     BROWSER_CHROME_MANIFESTS += ['mochitest/browser.ini']
diff --git a/platform/dom/plugins/test/testplugin/nptest.cpp b/platform/dom/plugins/test/testplugin/nptest.cpp
index aa759ac16..36c136b0e 100644
--- a/platform/dom/plugins/test/testplugin/nptest.cpp
+++ b/platform/dom/plugins/test/testplugin/nptest.cpp
@@ -3462,7 +3462,7 @@ stallPlugin(NPObject* npobj, const NPVariant* args, uint32_t argCount,
   return true;
 }
 
-#if defined(MOZ_WIDGET_GTK)
+#if 0
 bool
 getClipboardText(NPObject* npobj, const NPVariant* args, uint32_t argCount,
                  NPVariant* result)
diff --git a/platform/dom/plugins/test/testplugin/testplugin.mozbuild b/platform/dom/plugins/test/testplugin/testplugin.mozbuild
index 9ed4f8966..da553990d 100644
--- a/platform/dom/plugins/test/testplugin/testplugin.mozbuild
+++ b/platform/dom/plugins/test/testplugin/testplugin.mozbuild
@@ -18,10 +18,6 @@ if toolkit == 'cocoa':
     UNIFIED_SOURCES += [
         'nptest_macosx.mm'
     ]
-elif toolkit in ('gtk2', 'gtk3'):
-    UNIFIED_SOURCES += [
-        'nptest_gtk2.cpp',
-    ]
 elif toolkit == 'android':
     UNIFIED_SOURCES += [
         'nptest_droid.cpp',
@@ -49,14 +45,6 @@ if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'windows':
 if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa' and '64' in CONFIG['OS_TEST']:
     OS_LIBS += ['-framework Carbon']
 
-if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('gtk2', 'gtk3'):
-    CXXFLAGS += CONFIG['MOZ_GTK2_CFLAGS']
-    CFLAGS += CONFIG['MOZ_GTK2_CFLAGS']
-    OS_LIBS += CONFIG['MOZ_GTK2_LIBS']
-    OS_LIBS += CONFIG['XLDFLAGS']
-    OS_LIBS += CONFIG['XLIBS']
-    OS_LIBS += CONFIG['XEXT_LIBS']
-
 if CONFIG['_MSC_VER']:
     # This is intended as a temporary hack to support building with VS2015.
     # conversion from 'X' to 'Y' requires a narrowing conversion
diff --git a/platform/gfx/thebes/gfxGdkNativeRenderer.cpp b/platform/gfx/thebes/gfxGdkNativeRenderer.cpp
index f8964ad8f..ff58e43b6 100644
--- a/platform/gfx/thebes/gfxGdkNativeRenderer.cpp
+++ b/platform/gfx/thebes/gfxGdkNativeRenderer.cpp
@@ -7,7 +7,7 @@
 #include "gfxContext.h"
 #include "gfxPlatformGtk.h"
 
-#ifdef MOZ_X11
+#if 0
 #include <gdk/gdkx.h>
 #include "cairo-xlib.h"
 #include "gfxXlibSurface.h"
diff --git a/platform/gfx/thebes/gfxGdkNativeRenderer.h b/platform/gfx/thebes/gfxGdkNativeRenderer.h
index d95b1fef0..ea88e9645 100644
--- a/platform/gfx/thebes/gfxGdkNativeRenderer.h
+++ b/platform/gfx/thebes/gfxGdkNativeRenderer.h
@@ -6,9 +6,9 @@
 #ifndef GFXGDKNATIVERENDER_H_
 #define GFXGDKNATIVERENDER_H_
 
-#include <gdk/gdk.h>
+//#include <gdk/gdk.h>
 #include "nsSize.h"
-#ifdef MOZ_X11
+#if 0
 #include "gfxXlibNativeRenderer.h"
 #endif
 
@@ -21,7 +21,7 @@ class gfxContext;
  * to all Thebes transformations, clipping etc.
  */
 class gfxGdkNativeRenderer
-#ifdef MOZ_X11
+#if 0
     : private gfxXlibNativeRenderer
 #endif
 {
@@ -35,7 +35,7 @@ public:
      * no clipping is required
      */
 
-#if (MOZ_WIDGET_GTK == 2)
+#if 0
     virtual nsresult DrawWithGDK(GdkDrawable * drawable, gint offsetX, 
             gint offsetY, GdkRectangle * clipRects, uint32_t numClipRects) = 0;
 #endif
@@ -46,7 +46,7 @@ public:
         // will be set and there is no dependence on what the existing pixels
         // in the drawable are set to.
         DRAW_IS_OPAQUE =
-#ifdef MOZ_X11
+#if 0
             gfxXlibNativeRenderer::DRAW_IS_OPAQUE
 #else
             0x1
@@ -54,7 +54,7 @@ public:
         // If set, then numClipRects can be zero or one.
         // If not set, then numClipRects will be zero.
         , DRAW_SUPPORTS_CLIP_RECT =
-#ifdef MOZ_X11
+#if 0
             gfxXlibNativeRenderer::DRAW_SUPPORTS_CLIP_RECT
 #else
             0x2
@@ -67,13 +67,13 @@ public:
      * the rectangle (offset.x,offset.y,bounds.width,bounds.height)
      * @param dpy a display to use for the drawing if ctx doesn't have one
      */
-#if (MOZ_WIDGET_GTK == 2)
+#if 0
     void Draw(gfxContext* ctx, mozilla::gfx::IntSize size,
               uint32_t flags, GdkColormap* colormap);
 #endif
 
 private:
-#ifdef MOZ_X11
+#if 0
     // for gfxXlibNativeRenderer:
     virtual nsresult DrawWithXlib(cairo_surface_t* surface,
                                   nsIntPoint offset,
diff --git a/platform/media/webrtc/trunk/peerconnection_client.target.mk b/platform/media/webrtc/trunk/peerconnection_client.target.mk
index 3c4320a18..3195e5d02 100644
--- a/platform/media/webrtc/trunk/peerconnection_client.target.mk
+++ b/platform/media/webrtc/trunk/peerconnection_client.target.mk
@@ -59,8 +59,6 @@ CFLAGS_Debug := \
 	-pipe \
 	-fPIC \
 	-pthread \
-	-I/usr/include/gtk-2.0 \
-	-I/usr/lib64/gtk-2.0/include \
 	-I/usr/include/atk-1.0 \
 	-I/usr/include/cairo \
 	-I/usr/include/gdk-pixbuf-2.0 \
@@ -149,8 +147,6 @@ CFLAGS_Release := \
 	-pipe \
 	-fPIC \
 	-pthread \
-	-I/usr/include/gtk-2.0 \
-	-I/usr/lib64/gtk-2.0/include \
 	-I/usr/include/atk-1.0 \
 	-I/usr/include/cairo \
 	-I/usr/include/gdk-pixbuf-2.0 \
@@ -241,8 +237,6 @@ LDFLAGS_Release := \
 
 LIBS := \
 	 \
-	-lgtk-x11-2.0 \
-	-lgdk-x11-2.0 \
 	-latk-1.0 \
 	-lgio-2.0 \
 	-lpangoft2-1.0 \
diff --git a/platform/old-configure.in b/platform/old-configure.in
index ade675e95..d2bc699fd 100644
--- a/platform/old-configure.in
+++ b/platform/old-configure.in
@@ -59,7 +59,6 @@ GLIB_VERSION=2.22
 GLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_26
 GIO_VERSION=2.22
 CAIRO_VERSION=1.10
-GTK2_VERSION=2.18.0
 GTK3_VERSION=3.4.0
 GDK_VERSION_MAX_ALLOWED=GDK_VERSION_3_4
 WINDRES_VERSION=2.14.90
@@ -2332,13 +2331,8 @@ if test "$COMPILE_ENVIRONMENT"; then
     AC_DEFINE_UNQUOTED(GLIB_VERSION_MIN_REQUIRED,$GLIB_VERSION_MIN_REQUIRED)
     AC_DEFINE_UNQUOTED(GLIB_VERSION_MAX_ALLOWED,$GLIB_VERSION_MAX_ALLOWED)
 
-    PKG_CHECK_MODULES(MOZ_GTK2, gtk+-2.0 >= $GTK2_VERSION gtk+-unix-print-2.0 glib-2.0 >= $GLIB_VERSION gobject-2.0 $GDK_PACKAGES)
     MOZ_GTK2_CFLAGS="-I${_topsrcdir}/widget/gtk/compat $MOZ_GTK2_CFLAGS"
   fi
-  if test "$MOZ_WIDGET_TOOLKIT" = gtk2; then
-    TK_CFLAGS=$MOZ_GTK2_CFLAGS
-    TK_LIBS=$MOZ_GTK2_LIBS
-  fi
 fi # COMPILE_ENVIRONMENT
 
 AC_SUBST(MOZ_FS_LAYOUT)
diff --git a/platform/widget/gtk/mozgtk/moz.build b/platform/widget/gtk/mozgtk/moz.build
index 528e2e9d0..d32ee829e 100644
--- a/platform/widget/gtk/mozgtk/moz.build
+++ b/platform/widget/gtk/mozgtk/moz.build
@@ -4,4 +4,4 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-DIRS += ['stub', 'gtk2', 'gtk3']
+DIRS += ['stub', 'gtk3']
diff --git a/platform/widget/gtk/mozgtk/mozgtk.c b/platform/widget/gtk/mozgtk/mozgtk.c
index d0b87613b..8247764cf 100644
--- a/platform/widget/gtk/mozgtk/mozgtk.c
+++ b/platform/widget/gtk/mozgtk/mozgtk.c
@@ -598,21 +598,6 @@ STUB(gtk_color_chooser_get_rgba)
 STUB(gtk_color_chooser_set_use_alpha)
 #endif
 
-#ifdef GTK2_SYMBOLS
-STUB(gdk_drawable_get_screen)
-STUB(gdk_rgb_get_colormap)
-STUB(gdk_rgb_get_visual)
-STUB(gdk_window_lookup)
-STUB(gdk_window_set_back_pixmap)
-STUB(gdk_x11_colormap_foreign_new)
-STUB(gdk_x11_colormap_get_xcolormap)
-STUB(gdk_x11_drawable_get_xdisplay)
-STUB(gdk_x11_drawable_get_xid)
-STUB(gdk_x11_window_get_drawable_impl)
-STUB(gdkx_visual_get)
-STUB(gtk_object_get_type)
-#endif
-
 #ifndef GTK3_SYMBOLS
 // Only define the following workaround when using GTK3, which we detect
 // by checking if GTK3 stubs are not provided.
diff --git a/platform/widget/gtk/mozgtk/stub/moz.build b/platform/widget/gtk/mozgtk/stub/moz.build
index 1a8e21001..3ed3d1be4 100644
--- a/platform/widget/gtk/mozgtk/stub/moz.build
+++ b/platform/widget/gtk/mozgtk/stub/moz.build
@@ -8,7 +8,7 @@ SOURCES += [
     '../mozgtk.c',
 ]
 
-for var in ('COMMON_SYMBOLS', 'GTK2_SYMBOLS', 'GTK3_SYMBOLS'):
+for var in ('COMMON_SYMBOLS', 'GTK3_SYMBOLS'):
     DEFINES[var] = True
 
 SharedLibrary('mozgtk_stub')
diff --git a/platform/widget/gtk/nsWindow.cpp b/platform/widget/gtk/nsWindow.cpp
index 6f222a705..081ba9ca5 100644
--- a/platform/widget/gtk/nsWindow.cpp
+++ b/platform/widget/gtk/nsWindow.cpp
@@ -81,7 +81,7 @@
 #include "nsIPropertyBag2.h"
 #include "GLContext.h"
 #include "gfx2DGlue.h"
-#include "nsPluginNativeWindowGtk.h"
+//#include "nsPluginNativeWindowGtk.h"
 
 #ifdef ACCESSIBILITY
 #include "mozilla/a11y/Accessible.h"
@@ -1177,18 +1177,6 @@ nsWindow::Resize(double aX, double aY, double aWidth, double aHeight,
 void
 nsWindow::ResizePluginSocketWidget()
 {
-    // e10s specific, a eWindowType_plugin_ipc_chrome holds its own
-    // nsPluginNativeWindowGtk wrapper. We are responsible for resizing
-    // the embedded socket widget.
-    if (mWindowType == eWindowType_plugin_ipc_chrome) {
-        nsPluginNativeWindowGtk* wrapper = (nsPluginNativeWindowGtk*)
-          GetNativeData(NS_NATIVE_PLUGIN_OBJECT_PTR);
-        if (wrapper) {
-            wrapper->width = mBounds.width;
-            wrapper->height = mBounds.height;
-            wrapper->SetAllocation();
-        }
-    }
 }
 
 NS_IMETHODIMP
@@ -1732,14 +1720,6 @@ nsWindow::GetNativeData(uint32_t aDataType)
     case NS_NATIVE_PLUGIN_PORT:
         return SetupPluginPort();
 
-    case NS_NATIVE_PLUGIN_ID:
-        if (!mPluginNativeWindow) {
-          NS_WARNING("no native plugin instance!");
-          return nullptr;
-        }
-        // Return the socket widget XID
-        return (void*)mPluginNativeWindow->window;
-
     case NS_NATIVE_DISPLAY: {
 #ifdef MOZ_X11
         GdkDisplay* gdkDisplay = gdk_display_get_default();
@@ -1754,8 +1734,6 @@ nsWindow::GetNativeData(uint32_t aDataType)
 
     case NS_NATIVE_SHAREABLE_WINDOW:
         return (void *) GDK_WINDOW_XID(gdk_window_get_toplevel(mGdkWindow));
-    case NS_NATIVE_PLUGIN_OBJECT_PTR:
-        return (void *) mPluginNativeWindow;
     case NS_RAW_NATIVE_IME_CONTEXT: {
         void* pseudoIMEContext = GetPseudoIMEContext();
         if (pseudoIMEContext) {
@@ -1783,11 +1761,6 @@ nsWindow::GetNativeData(uint32_t aDataType)
 void
 nsWindow::SetNativeData(uint32_t aDataType, uintptr_t aVal)
 {
-    if (aDataType != NS_NATIVE_PLUGIN_OBJECT_PTR) {
-        NS_WARNING("nsWindow::SetNativeData called with bad value");
-        return;
-    }
-    mPluginNativeWindow = (nsPluginNativeWindowGtk*)aVal;
 }
 
 NS_IMETHODIMP
diff --git a/platform/widget/gtk/nsWindow.h b/platform/widget/gtk/nsWindow.h
index c45176cea..e9eed4d9f 100644
--- a/platform/widget/gtk/nsWindow.h
+++ b/platform/widget/gtk/nsWindow.h
@@ -17,7 +17,7 @@
 #include "nsRefPtrHashtable.h"
 
 #include "nsBaseWidget.h"
-#include <gdk/gdk.h>
+//#include <gdk/gdk.h>
 #include <gtk/gtk.h>
 
 #ifdef MOZ_X11
diff --git a/platform/widget/moz.build b/platform/widget/moz.build
index 3a52805b0..bf420e184 100644
--- a/platform/widget/moz.build
+++ b/platform/widget/moz.build
@@ -53,9 +53,6 @@ if toolkit in ('cocoa', 'gtk2', 'gtk3'):
 if 'gtk' in CONFIG['MOZ_WIDGET_TOOLKIT']:
     DIRS += ['gtk']
 
-    if CONFIG['MOZ_X11']:
-        DIRS += ['gtkxtbin']
-
 XPIDL_SOURCES += [
     'nsIAppShell.idl',
     'nsIBaseWindow.idl',
