diff --git a/gfx/layers/d3d9/ImageLayerD3D9.cpp b/gfx/layers/d3d9/ImageLayerD3D9.cpp
index c1e14e80b9c3..4f56e02800f0 100644
--- a/gfx/layers/d3d9/ImageLayerD3D9.cpp
+++ b/gfx/layers/d3d9/ImageLayerD3D9.cpp
@@ -184,31 +184,31 @@ static void AllocateTexturesYCbCr(PlanarYCbCrImage *aImage,
 
     HRESULT hr;
     hr = aDevice->CreateTexture(data->mYSize.width, data->mYSize.height,
-                                1, 0, D3DFMT_L8, D3DPOOL_DEFAULT,
+                                1, 0, D3DFMT_A8, D3DPOOL_DEFAULT,
                                 getter_AddRefs(backendData->mYTexture), nullptr);
     if (!FAILED(hr)) {
       hr = aDevice->CreateTexture(data->mCbCrSize.width, data->mCbCrSize.height,
-                                  1, 0, D3DFMT_L8, D3DPOOL_DEFAULT,
+                                  1, 0, D3DFMT_A8, D3DPOOL_DEFAULT,
                                   getter_AddRefs(backendData->mCbTexture), nullptr);
     }
     if (!FAILED(hr)) {
       hr = aDevice->CreateTexture(data->mCbCrSize.width, data->mCbCrSize.height,
-                                  1, 0, D3DFMT_L8, D3DPOOL_DEFAULT,
+                                  1, 0, D3DFMT_A8, D3DPOOL_DEFAULT,
                                   getter_AddRefs(backendData->mCrTexture), nullptr);
     }
     if (!FAILED(hr)) {
       hr = aDevice->CreateTexture(data->mYSize.width, data->mYSize.height,
-                                  1, 0, D3DFMT_L8, D3DPOOL_SYSTEMMEM,
+                                  1, 0, D3DFMT_A8, D3DPOOL_SYSTEMMEM,
                                   getter_AddRefs(tmpYTexture), nullptr);
     }
     if (!FAILED(hr)) {
       hr = aDevice->CreateTexture(data->mCbCrSize.width, data->mCbCrSize.height,
-                                  1, 0, D3DFMT_L8, D3DPOOL_SYSTEMMEM,
+                                  1, 0, D3DFMT_A8, D3DPOOL_SYSTEMMEM,
                                   getter_AddRefs(tmpCbTexture), nullptr);
     }
     if (!FAILED(hr)) {
       hr = aDevice->CreateTexture(data->mCbCrSize.width, data->mCbCrSize.height,
-                                  1, 0, D3DFMT_L8, D3DPOOL_SYSTEMMEM,
+                                  1, 0, D3DFMT_A8, D3DPOOL_SYSTEMMEM,
                                   getter_AddRefs(tmpCrTexture), nullptr);
     }
 
@@ -227,16 +227,16 @@ static void AllocateTexturesYCbCr(PlanarYCbCrImage *aImage,
   } else {
     HRESULT hr;
     hr = aDevice->CreateTexture(data->mYSize.width, data->mYSize.height,
-                                1, 0, D3DFMT_L8, D3DPOOL_MANAGED,
+                                1, 0, D3DFMT_A8, D3DPOOL_MANAGED,
                                 getter_AddRefs(backendData->mYTexture), nullptr);
     if (!FAILED(hr)) {
       aDevice->CreateTexture(data->mCbCrSize.width, data->mCbCrSize.height,
-                             1, 0, D3DFMT_L8, D3DPOOL_MANAGED,
+                             1, 0, D3DFMT_A8, D3DPOOL_MANAGED,
                              getter_AddRefs(backendData->mCbTexture), nullptr);
     }
     if (!FAILED(hr)) {
       aDevice->CreateTexture(data->mCbCrSize.width, data->mCbCrSize.height,
-                             1, 0, D3DFMT_L8, D3DPOOL_MANAGED,
+                             1, 0, D3DFMT_A8, D3DPOOL_MANAGED,
                              getter_AddRefs(backendData->mCrTexture), nullptr);
     }
 
diff --git a/gfx/layers/d3d9/LayerManagerD3D9Shaders.hlsl b/gfx/layers/d3d9/LayerManagerD3D9Shaders.hlsl
index 35e6b16fad34..710edb796022 100644
--- a/gfx/layers/d3d9/LayerManagerD3D9Shaders.hlsl
+++ b/gfx/layers/d3d9/LayerManagerD3D9Shaders.hlsl
@@ -189,9 +189,9 @@ float4 YCbCrShader(const VS_OUTPUT aVertex) : COLOR
   float4 yuv;
   float4 color;
 
-  yuv.r = tex2D(s2DCr, aVertex.vTexCoords).r - 0.5;
-  yuv.g = tex2D(s2DY, aVertex.vTexCoords).r - 0.0625;
-  yuv.b = tex2D(s2DCb, aVertex.vTexCoords).r - 0.5;
+  yuv.r = tex2D(s2DCr, aVertex.vTexCoords).a - 0.5;
+  yuv.g = tex2D(s2DY, aVertex.vTexCoords).a - 0.0625;
+  yuv.b = tex2D(s2DCb, aVertex.vTexCoords).a - 0.5;
 
   color.r = yuv.g * 1.164 + yuv.r * 1.596;
   color.g = yuv.g * 1.164 - 0.813 * yuv.r - 0.391 * yuv.b;
@@ -255,9 +255,9 @@ float4 YCbCrShaderMask(const VS_OUTPUT_MASK aVertex) : COLOR
   float4 yuv;
   float4 color;
 
-  yuv.r = tex2D(s2DCr, aVertex.vTexCoords).r - 0.5;
-  yuv.g = tex2D(s2DY, aVertex.vTexCoords).r - 0.0625;
-  yuv.b = tex2D(s2DCb, aVertex.vTexCoords).r - 0.5;
+  yuv.r = tex2D(s2DCr, aVertex.vTexCoords).a - 0.5;
+  yuv.g = tex2D(s2DY, aVertex.vTexCoords).a - 0.0625;
+  yuv.b = tex2D(s2DCb, aVertex.vTexCoords).a - 0.5;
 
   color.r = yuv.g * 1.164 + yuv.r * 1.596;
   color.g = yuv.g * 1.164 - 0.813 * yuv.r - 0.391 * yuv.b;
diff --git a/gfx/layers/d3d9/TextureD3D9.cpp b/gfx/layers/d3d9/TextureD3D9.cpp
index 793b17a4bb8c..0c616df26368 100644
--- a/gfx/layers/d3d9/TextureD3D9.cpp
+++ b/gfx/layers/d3d9/TextureD3D9.cpp
@@ -358,17 +358,17 @@ DeprecatedTextureHostYCbCrD3D9::UpdateImpl(const SurfaceDescriptor& aImage,
                                yuvDeserializer.GetYData(),
                                yuvDeserializer.GetYStride(),
                                size,
-                               D3DFMT_L8, 1);
+                               D3DFMT_A8, 1);
   mTextures[1] = DataToTexture(mDevice,
                                yuvDeserializer.GetCbData(),
                                yuvDeserializer.GetCbCrStride(),
                                gfxCbCrSize,
-                               D3DFMT_L8, 1);
+                               D3DFMT_A8, 1);
   mTextures[2] = DataToTexture(mDevice,
                                yuvDeserializer.GetCrData(),
                                yuvDeserializer.GetCbCrStride(),
                                gfxCbCrSize,
-                               D3DFMT_L8, 1);
+                               D3DFMT_A8, 1);
 }
 
 // aTexture should be in SYSTEMMEM, returns a texture in the default