--- a/gfx/layers/wr/WebRenderBridgeParent.cpp
+++ b/gfx/layers/wr/WebRenderBridgeParent.cpp
@@ -1105,22 +1105,19 @@ WebRenderBridgeParent::CompositeToTarget
 
   bool scheduleComposite = false;
   nsTArray<wr::WrOpacityProperty> opacityArray;
   nsTArray<wr::WrTransformProperty> transformArray;
 
   mCompositableHolder->SetCompositionTime(TimeStamp::Now());
   mCompositableHolder->ApplyAsyncImages(mApi);
 
-  if (gfxPrefs::WebRenderOMTAEnabled()) {
-    SampleAnimations(opacityArray, transformArray);
-
-    if (!transformArray.IsEmpty() || !opacityArray.IsEmpty()) {
-      scheduleComposite = true;
-    }
+  SampleAnimations(opacityArray, transformArray);
+  if (!transformArray.IsEmpty() || !opacityArray.IsEmpty()) {
+    scheduleComposite = true;
   }
 
   if (PushAPZStateToWR(transformArray)) {
     scheduleComposite = true;
   }
 
   wr::RenderThread::Get()->IncPendingFrameCount(mApi->GetId());
 

--- a/gfx/layers/wr/WebRenderContainerLayer.cpp
+++ b/gfx/layers/wr/WebRenderContainerLayer.cpp
@@ -38,18 +38,17 @@ WebRenderContainerLayer::RenderLayer(wr:
   nsTArray<LayerPolygon> children = SortChildrenBy3DZOrder(SortMode::WITHOUT_GEOMETRY);
 
   gfx::Matrix4x4 transform = GetTransform();
   gfx::Matrix4x4* transformForSC = &transform;
   float opacity = GetLocalOpacity();
   float* opacityForSC = &opacity;
   uint64_t animationsId = 0;
 
-  if (gfxPrefs::WebRenderOMTAEnabled() &&
-      !GetAnimations().IsEmpty()) {
+  if (!GetAnimations().IsEmpty()) {
     MOZ_ASSERT(GetCompositorAnimationsId());
 
     OptionalOpacity opacityForCompositor = void_t();
     OptionalTransform transformForCompositor = void_t();
 
     // Update opacity as nullptr in stacking context if there exists
     // opacity animation, the opacity value will be resolved
     // after animation sampling on the compositor

--- a/gfx/layers/wr/WebRenderContainerLayer.h
+++ b/gfx/layers/wr/WebRenderContainerLayer.h
@@ -22,19 +22,17 @@ public:
     : ContainerLayer(aManager, static_cast<WebRenderLayer*>(this))
   {
     MOZ_COUNT_CTOR(WebRenderContainerLayer);
   }
 
 protected:
   virtual ~WebRenderContainerLayer()
   {
-
-    if (gfxPrefs::WebRenderOMTAEnabled() &&
-        !GetAnimations().IsEmpty()) {
+    if (!GetAnimations().IsEmpty()) {
       mManager->AsWebRenderLayerManager()->
         AddCompositorAnimationsIdForDiscard(GetCompositorAnimationsId());
     }
 
     ContainerLayer::RemoveAllChildren();
     MOZ_COUNT_DTOR(WebRenderContainerLayer);
   }
 

--- a/gfx/thebes/gfxPrefs.h
+++ b/gfx/thebes/gfxPrefs.h
@@ -476,17 +476,16 @@ private:
   DECL_GFX_PREF(Once, "gfx.touch.resample.delay-threshold",    TouchResampleVsyncDelayThreshold, int32_t, 20);
   DECL_GFX_PREF(Once, "gfx.touch.resample.max-predict",        TouchResampleMaxPredict, int32_t, 8);
   DECL_GFX_PREF(Once, "gfx.touch.resample.min-delta",          TouchResampleMinDelta, int32_t, 2);
   DECL_GFX_PREF(Once, "gfx.touch.resample.old-touch-threshold",TouchResampleOldTouchThreshold, int32_t, 17);
   DECL_GFX_PREF(Once, "gfx.touch.resample.vsync-adjust",       TouchVsyncSampleAdjust, int32_t, 5);
 
   DECL_GFX_PREF(Live, "gfx.vsync.collect-scroll-transforms",   CollectScrollTransforms, bool, false);
   DECL_GFX_PREF(Once, "gfx.vsync.compositor.unobserve-count",  CompositorUnobserveCount, int32_t, 10);
-  DECL_OVERRIDE_PREF(Live, "gfx.webrender.omta.enabled",       WebRenderOMTAEnabled, gfxPrefs::OverrideBase_WebRender());
   DECL_GFX_PREF(Live, "gfx.webrender.profiler.enabled",        WebRenderProfilerEnabled, bool, false);
   DECL_GFX_PREF(Live, "gfx.webrender.layers-free",             WebRenderLayersFree, bool, false);
   DECL_GFX_PREF(Live, "gfx.webrendest.enabled",                WebRendestEnabled, bool, false);
   // Use vsync events generated by hardware
   DECL_GFX_PREF(Once, "gfx.work-around-driver-bugs",           WorkAroundDriverBugs, bool, true);
   DECL_GFX_PREF(Once, "gfx.screen-mirroring.enabled",          ScreenMirroringEnabled, bool, false);
 
   DECL_GFX_PREF(Live, "gl.ignore-dx-interop2-blacklist",       IgnoreDXInterop2Blacklist, bool, false);

--- a/layout/painting/nsDisplayList.cpp
+++ b/layout/painting/nsDisplayList.cpp
@@ -6122,18 +6122,17 @@ nsDisplayOpacity::CreateWebRenderCommand
   RefPtr<WebRenderAnimationData> animationData = aManager->CreateOrRecycleWebRenderUserData<WebRenderAnimationData>(this);
   AnimationInfo& animationInfo = animationData->GetAnimationInfo();
   AddAnimationsForProperty(Frame(), aDisplayListBuilder,
                            this, eCSSProperty_opacity,
                            animationInfo, false);
   animationInfo.StartPendingAnimations(aManager->GetAnimationReadyTime());
   uint64_t animationsId = 0;
 
-  if (gfxPrefs::WebRenderOMTAEnabled() &&
-      !animationInfo.GetAnimations().IsEmpty()) {
+  if (!animationInfo.GetAnimations().IsEmpty()) {
     animationsId = animationInfo.GetCompositorAnimationsId();
     opacityForSC = nullptr;
     OptionalOpacity opacityForCompositor = mOpacity;
 
     OpAddCompositorAnimations
       anim(CompositorAnimations(animationInfo.GetAnimations(), animationsId),
            void_t(), opacityForCompositor);
     aManager->WrBridge()->AddWebRenderParentCommand(anim);
@@ -7715,18 +7714,17 @@ nsDisplayTransform::CreateWebRenderComma
 
   AnimationInfo& animationInfo = animationData->GetAnimationInfo();
   AddAnimationsForProperty(Frame(), aDisplayListBuilder,
                            this, eCSSProperty_transform,
                            animationInfo, false);
   animationInfo.StartPendingAnimations(aManager->GetAnimationReadyTime());
   uint64_t animationsId = 0;
 
-  if (gfxPrefs::WebRenderOMTAEnabled() &&
-      !animationInfo.GetAnimations().IsEmpty()) {
+  if (!animationInfo.GetAnimations().IsEmpty()) {
     animationsId = animationInfo.GetCompositorAnimationsId();
 
     // Update transfrom as nullptr in stacking context if there exists
     // transform animation, the transform value will be resolved
     // after animation sampling on the compositor
     transformForSC = nullptr;
 
     // Pass default transform to compositor in case gecko fails to