diff --git a/dom/ipc/ContentChild.cpp b/dom/ipc/ContentChild.cpp
index bce7fe037cd2..510aab718c57 100644
--- a/dom/ipc/ContentChild.cpp
+++ b/dom/ipc/ContentChild.cpp
@@ -2858,7 +2858,7 @@ void ContentChild::ShutdownInternal() {
     // We're in a nested event loop. Let's delay for an arbitrary period of
     // time (100ms) in the hopes that the event loop will have finished by
     // then.
-    MessageLoop::current()->PostDelayedTask(
+    GetCurrentSerialEventTarget()->DelayedDispatch(
         NewRunnableMethod("dom::ContentChild::RecvShutdown", this,
                           &ContentChild::ShutdownInternal),
         100);
diff --git a/dom/ipc/ContentParent.cpp b/dom/ipc/ContentParent.cpp
index 01b9e059a25a..12c1805cb472 100644
--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -1558,7 +1558,7 @@ void ContentParent::MaybeAsyncSendShutDownMessage() {
 
   // In the case of normal shutdown, send a shutdown message to child to
   // allow it to perform shutdown tasks.
-  MessageLoop::current()->PostTask(NewRunnableMethod<ShutDownMethod>(
+  GetCurrentSerialEventTarget()->Dispatch(NewRunnableMethod<ShutDownMethod>(
       "dom::ContentParent::ShutDownProcess", this,
       &ContentParent::ShutDownProcess, SEND_SHUTDOWN_MESSAGE));
 }
@@ -1899,7 +1899,7 @@ void ContentParent::ActorDestroy(ActorDestroyReason why) {
            this, mSubprocess,
            mSubprocess ? (uintptr_t)mSubprocess->GetChildProcessHandle() : -1));
   // FIXME (bug 1520997): does this really need an additional dispatch?
-  MessageLoop::current()->PostTask(NS_NewRunnableFunction(
+  GetCurrentSerialEventTarget()->Dispatch(NS_NewRunnableFunction(
       "DelayedDeleteSubprocessRunnable", [subprocess = mSubprocess] {
         MOZ_LOG(
             ContentParent::GetLog(), LogLevel::Debug,
diff --git a/dom/media/ipc/RDDProcessHost.cpp b/dom/media/ipc/RDDProcessHost.cpp
index a8bde4304287..20e4984dc209 100644
--- a/dom/media/ipc/RDDProcessHost.cpp
+++ b/dom/media/ipc/RDDProcessHost.cpp
@@ -243,7 +243,7 @@ void RDDProcessHost::DestroyProcess() {
     mTaskFactory.RevokeAll();
   }
 
-  MessageLoop::current()->PostTask(
+  GetCurrentSerialEventTarget()->Dispatch(
       NS_NewRunnableFunction("DestroyProcessRunnable", [this] { Destroy(); }));
 }
 
diff --git a/dom/plugins/ipc/PluginProcessChild.cpp b/dom/plugins/ipc/PluginProcessChild.cpp
index b1d780fd28b8..6b1021c84652 100644
--- a/dom/plugins/ipc/PluginProcessChild.cpp
+++ b/dom/plugins/ipc/PluginProcessChild.cpp
@@ -5,12 +5,13 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/plugins/PluginProcessChild.h"
-#include "mozilla/TaskController.h"
 
 #include "ClearOnShutdown.h"
 #include "base/command_line.h"
+#include "base/message_loop.h"  // for MessageLoop
 #include "base/string_util.h"
 #include "mozilla/AbstractThread.h"
+#include "mozilla/TaskController.h"
 #include "mozilla/ipc/IOThreadChild.h"
 #include "nsDebugImpl.h"
 #include "nsThreadManager.h"
diff --git a/gfx/ipc/GPUProcessHost.cpp b/gfx/ipc/GPUProcessHost.cpp
index 1afca99004f8..47ec5bde8f16 100644
--- a/gfx/ipc/GPUProcessHost.cpp
+++ b/gfx/ipc/GPUProcessHost.cpp
@@ -223,7 +223,7 @@ void GPUProcessHost::DestroyProcess() {
     mTaskFactory.RevokeAll();
   }
 
-  MessageLoop::current()->PostTask(
+  GetCurrentSerialEventTarget()->Dispatch(
       NS_NewRunnableFunction("DestroyProcessRunnable", [this] { Destroy(); }));
 }
 
diff --git a/gfx/layers/basic/BasicCompositor.cpp b/gfx/layers/basic/BasicCompositor.cpp
index 531fa038ad9d..309e4a38ed33 100644
--- a/gfx/layers/basic/BasicCompositor.cpp
+++ b/gfx/layers/basic/BasicCompositor.cpp
@@ -1134,7 +1134,7 @@ void BasicCompositor::TryToEndRemoteDrawing() {
     RefPtr<Runnable> runnable =
         NS_NewRunnableFunction("layers::BasicCompositor::TryToEndRemoteDrawing",
                                [self]() { self->TryToEndRemoteDrawing(); });
-    MessageLoop::current()->PostDelayedTask(runnable.forget(), retryMs);
+    GetCurrentSerialEventTarget()->DelayedDispatch(runnable.forget(), retryMs);
   } else {
     EndRemoteDrawing();
   }
diff --git a/gfx/layers/ipc/CompositorManagerParent.cpp b/gfx/layers/ipc/CompositorManagerParent.cpp
index 6ffaebc445f1..21d270691dfd 100644
--- a/gfx/layers/ipc/CompositorManagerParent.cpp
+++ b/gfx/layers/ipc/CompositorManagerParent.cpp
@@ -159,7 +159,7 @@ void CompositorManagerParent::ActorDestroy(ActorDestroyReason aReason) {
 }
 
 void CompositorManagerParent::ActorDealloc() {
-  MessageLoop::current()->PostTask(
+  GetCurrentSerialEventTarget()->Dispatch(
       NewRunnableMethod("layers::CompositorManagerParent::DeferredDestroy",
                         this, &CompositorManagerParent::DeferredDestroy));
 
diff --git a/gfx/layers/ipc/ContentCompositorBridgeParent.cpp b/gfx/layers/ipc/ContentCompositorBridgeParent.cpp
index 180553a7eb97..416dee10687d 100644
--- a/gfx/layers/ipc/ContentCompositorBridgeParent.cpp
+++ b/gfx/layers/ipc/ContentCompositorBridgeParent.cpp
@@ -10,9 +10,6 @@
 
 #include "LayerTransactionParent.h"   // for LayerTransactionParent
 #include "apz/src/APZCTreeManager.h"  // for APZCTreeManager
-#include "base/message_loop.h"        // for MessageLoop
-#include "base/task.h"                // for CancelableTask, etc
-#include "base/thread.h"              // for Thread
 #include "gfxUtils.h"
 #ifdef XP_WIN
 #  include "mozilla/gfx/DeviceManagerDx.h"  // for DeviceManagerDx
@@ -68,7 +65,7 @@ void ContentCompositorBridgeParent::ActorDestroy(ActorDestroyReason aWhy) {
 
   // We must keep this object alive untill the code handling message
   // reception is finished on this thread.
-  MessageLoop::current()->PostTask(NewRunnableMethod(
+  GetCurrentSerialEventTarget()->Dispatch(NewRunnableMethod(
       "layers::ContentCompositorBridgeParent::DeferredDestroy", this,
       &ContentCompositorBridgeParent::DeferredDestroy));
 }
diff --git a/gfx/vr/ipc/VRGPUParent.cpp b/gfx/vr/ipc/VRGPUParent.cpp
index 8c39b9cac7d9..27b93d790851 100644
--- a/gfx/vr/ipc/VRGPUParent.cpp
+++ b/gfx/vr/ipc/VRGPUParent.cpp
@@ -31,7 +31,7 @@ void VRGPUParent::ActorDestroy(ActorDestroyReason aWhy) {
 #endif
 
   mClosed = true;
-  MessageLoop::current()->PostTask(
+  GetCurrentSerialEventTarget()->Dispatch(
       NewRunnableMethod("gfx::VRGPUParent::DeferredDestroy", this,
                         &VRGPUParent::DeferredDestroy));
 }
@@ -42,8 +42,10 @@ void VRGPUParent::DeferredDestroy() { mSelfRef = nullptr; }
 RefPtr<VRGPUParent> VRGPUParent::CreateForGPU(
     Endpoint<PVRGPUParent>&& aEndpoint) {
   RefPtr<VRGPUParent> vcp = new VRGPUParent(aEndpoint.OtherPid());
-  MessageLoop::current()->PostTask(NewRunnableMethod<Endpoint<PVRGPUParent>&&>(
-      "gfx::VRGPUParent::Bind", vcp, &VRGPUParent::Bind, std::move(aEndpoint)));
+  GetCurrentSerialEventTarget()->Dispatch(
+      NewRunnableMethod<Endpoint<PVRGPUParent>&&>("gfx::VRGPUParent::Bind", vcp,
+                                                  &VRGPUParent::Bind,
+                                                  std::move(aEndpoint)));
 
   return vcp;
 }
diff --git a/netwerk/ipc/SocketProcessBridgeChild.cpp b/netwerk/ipc/SocketProcessBridgeChild.cpp
index 93792f55db3b..01a5a7ad3505 100644
--- a/netwerk/ipc/SocketProcessBridgeChild.cpp
+++ b/netwerk/ipc/SocketProcessBridgeChild.cpp
@@ -155,7 +155,7 @@ void SocketProcessBridgeChild::ActorDestroy(ActorDestroyReason aWhy) {
   if (os) {
     os->RemoveObserver(this, "content-child-shutdown");
   }
-  MessageLoop::current()->PostTask(
+  GetCurrentSerialEventTarget()->Dispatch(
       NewRunnableMethod("net::SocketProcessBridgeChild::DeferredDestroy", this,
                         &SocketProcessBridgeChild::DeferredDestroy));
   mShuttingDown = true;
diff --git a/netwerk/ipc/SocketProcessBridgeParent.cpp b/netwerk/ipc/SocketProcessBridgeParent.cpp
index 78019eb199c6..9427f1388c9a 100644
--- a/netwerk/ipc/SocketProcessBridgeParent.cpp
+++ b/netwerk/ipc/SocketProcessBridgeParent.cpp
@@ -49,7 +49,7 @@ void SocketProcessBridgeParent::ActorDestroy(ActorDestroyReason aWhy) {
   LOG(("SocketProcessBridgeParent::ActorDestroy mId=%d\n", mId));
 
   mClosed = true;
-  MessageLoop::current()->PostTask(
+  GetCurrentSerialEventTarget()->Dispatch(
       NewRunnableMethod("net::SocketProcessBridgeParent::DeferredDestroy", this,
                         &SocketProcessBridgeParent::DeferredDestroy));
 }
diff --git a/netwerk/ipc/SocketProcessHost.cpp b/netwerk/ipc/SocketProcessHost.cpp
index e73d7bcd31bf..4079ed4f89f7 100644
--- a/netwerk/ipc/SocketProcessHost.cpp
+++ b/netwerk/ipc/SocketProcessHost.cpp
@@ -5,12 +5,12 @@
 
 #include "SocketProcessHost.h"
 
-#include "nsAppRunner.h"
-#include "nsIObserverService.h"
-#include "nsIOService.h"
-#include "SocketProcessParent.h"
 #include "ProcessUtils.h"
+#include "SocketProcessParent.h"
 #include "mozilla/ipc/FileDescriptor.h"
+#include "nsAppRunner.h"
+#include "nsIOService.h"
+#include "nsIObserverService.h"
 
 #if defined(XP_LINUX) && defined(MOZ_SANDBOX)
 #  include "mozilla/SandboxBroker.h"
@@ -224,7 +224,7 @@ void SocketProcessHost::DestroyProcess() {
     mTaskFactory.RevokeAll();
   }
 
-  MessageLoop::current()->PostTask(NS_NewRunnableFunction(
+  GetCurrentSerialEventTarget()->Dispatch(NS_NewRunnableFunction(
       "DestroySocketProcessRunnable", [this] { Destroy(); }));
 }