diff --git a/gfx/ipc/GPUProcessHost.cpp b/gfx/ipc/GPUProcessHost.cpp
index d8e17316df15..243c770b79f5 100644
--- a/gfx/ipc/GPUProcessHost.cpp
+++ b/gfx/ipc/GPUProcessHost.cpp
@@ -11,6 +11,7 @@
 #include "nsITimer.h"
 #include "mozilla/Preferences.h"
 #include "VRGPUChild.h"
+#include "ProcessUtils.h"
 
 namespace mozilla {
 namespace gfx {
@@ -35,6 +36,12 @@ bool GPUProcessHost::Launch(StringVector aExtraOpts) {
   MOZ_ASSERT(!mGPUChild);
   MOZ_ASSERT(!gfxPlatform::IsHeadless());
 
+  mPrefSerializer = MakeUnique<ipc::SharedPreferenceSerializer>();
+  if (!mPrefSerializer->SerializeToSharedMemory()) {
+    return false;
+  }
+  mPrefSerializer->AddSharedPrefCmdLineArgs(*this, aExtraOpts);
+
 #if defined(XP_WIN) && defined(MOZ_SANDBOX)
   mSandboxLevel = Preferences::GetInt("security.sandbox.gpu.level");
 #endif
@@ -123,6 +130,7 @@ void GPUProcessHost::InitAfterConnect(bool aSucceeded) {
   MOZ_ASSERT(!mGPUChild);
 
   mLaunchPhase = LaunchPhase::Complete;
+  mPrefSerializer = nullptr;
 
   if (aSucceeded) {
     mProcessToken = ++sProcessTokenCounter;
diff --git a/gfx/ipc/GPUProcessHost.h b/gfx/ipc/GPUProcessHost.h
index 6118a5453d4e..22f53db0672a 100644
--- a/gfx/ipc/GPUProcessHost.h
+++ b/gfx/ipc/GPUProcessHost.h
@@ -13,6 +13,11 @@
 #include "mozilla/ipc/ProtocolUtils.h"
 #include "mozilla/ipc/TaskFactory.h"
 
+namespace mozilla {
+namespace ipc {
+class SharedPreferenceSerializer;
+}
+}  // namespace mozilla
 class nsITimer;
 
 namespace mozilla {
@@ -122,6 +127,8 @@ class GPUProcessHost final : public mozilla::ipc::GeckoChildProcessHost {
   UniquePtr<GPUChild> mGPUChild;
   uint64_t mProcessToken;
 
+  UniquePtr<mozilla::ipc::SharedPreferenceSerializer> mPrefSerializer;
+
   bool mShutdownRequested;
   bool mChannelClosed;
 
diff --git a/gfx/ipc/GPUProcessImpl.cpp b/gfx/ipc/GPUProcessImpl.cpp
index ad8bae20a6c1..2193169933f1 100644
--- a/gfx/ipc/GPUProcessImpl.cpp
+++ b/gfx/ipc/GPUProcessImpl.cpp
@@ -6,6 +6,7 @@
 #include "GPUProcessImpl.h"
 #include "mozilla/ipc/IOThreadChild.h"
 #include "nsXPCOM.h"
+#include "ProcessUtils.h"
 
 #if defined(OS_WIN) && defined(MOZ_SANDBOX)
 #  include "mozilla/sandboxTarget.h"
@@ -26,15 +27,48 @@ bool GPUProcessImpl::Init(int aArgc, char* aArgv[]) {
   mozilla::SandboxTarget::Instance()->StartSandbox();
 #endif
   char* parentBuildID = nullptr;
+  char* prefsHandle = nullptr;
+  char* prefMapHandle = nullptr;
+  char* prefsLen = nullptr;
+  char* prefMapSize = nullptr;
   for (int i = 1; i < aArgc; i++) {
     if (!aArgv[i]) {
       continue;
     }
     if (strcmp(aArgv[i], "-parentBuildID") == 0) {
       parentBuildID = aArgv[i + 1];
+
+#ifdef XP_WIN
+    } else if (strcmp(aArgv[i], "-prefsHandle") == 0) {
+      if (++i == aArgc) {
+        return false;
+      }
+      prefsHandle = aArgv[i];
+    } else if (strcmp(aArgv[i], "-prefMapHandle") == 0) {
+      if (++i == aArgc) {
+        return false;
+      }
+      prefMapHandle = aArgv[i];
+#endif
+    } else if (strcmp(aArgv[i], "-prefsLen") == 0) {
+      if (++i == aArgc) {
+        return false;
+      }
+      prefsLen = aArgv[i];
+    } else if (strcmp(aArgv[i], "-prefMapSize") == 0) {
+      if (++i == aArgc) {
+        return false;
+      }
+      prefMapSize = aArgv[i];
     }
   }
 
+  SharedPreferenceDeserializer deserializer;
+  if (!deserializer.DeserializeFromSharedMemory(prefsHandle, prefMapHandle,
+                                                prefsLen, prefMapSize)) {
+    return false;
+  }
+
   return mGPU.Init(ParentPid(), parentBuildID, IOThreadChild::message_loop(),
                    IOThreadChild::channel());
 }