diff --git a/gfx/layers/ipc/ShadowLayersParent.cpp b/gfx/layers/ipc/ShadowLayersParent.cpp
index a35e45cb384..b64785b0e98 100644
--- a/gfx/layers/ipc/ShadowLayersParent.cpp
+++ b/gfx/layers/ipc/ShadowLayersParent.cpp
@@ -246,11 +246,8 @@ ShadowLayersParent::RecvUpdate(const InfallibleTArray<Edit>& cset,
       layer->SetClipRect(common.useClipRect() ? &common.clipRect() : NULL);
       layer->SetBaseTransform(common.transform().value());
       layer->SetPostScale(common.postXScale(), common.postYScale());
-      static bool fixedPositionLayersEnabled = getenv("MOZ_ENABLE_FIXED_POSITION_LAYERS") != 0;
-      if (fixedPositionLayersEnabled) {
-        layer->SetIsFixedPosition(common.isFixedPosition());
-        layer->SetFixedPositionAnchor(common.fixedPositionAnchor());
-      }
+      layer->SetIsFixedPosition(common.isFixedPosition());
+      layer->SetFixedPositionAnchor(common.fixedPositionAnchor());
       if (PLayerParent* maskLayer = common.maskLayerParent()) {
         layer->SetMaskLayer(cast(maskLayer)->AsLayer());
       } else {
diff --git a/layout/base/nsDisplayList.cpp b/layout/base/nsDisplayList.cpp
index e211042091b..4e3f7298913 100644
--- a/layout/base/nsDisplayList.cpp
+++ b/layout/base/nsDisplayList.cpp
@@ -552,11 +552,8 @@ static bool ForceVisiblityForFixedItem(nsDisplayListBuilder* aBuilder,
 
 void nsDisplayListBuilder::SetDisplayPort(const nsRect& aDisplayPort)
 {
-    static bool fixedPositionLayersEnabled = getenv("MOZ_ENABLE_FIXED_POSITION_LAYERS") != 0;
-    if (fixedPositionLayersEnabled) {
-      mHasDisplayPort = true;
-      mDisplayPort = aDisplayPort;
-    }
+    mHasDisplayPort = true;
+    mDisplayPort = aDisplayPort;
 }
 
 void nsDisplayListBuilder::MarkOutOfFlowFrameForDisplay(nsIFrame* aDirtyFrame,
diff --git a/mobile/android/base/GeckoAppShell.java b/mobile/android/base/GeckoAppShell.java
index e7551bf65de..e768b4fa254 100644
--- a/mobile/android/base/GeckoAppShell.java
+++ b/mobile/android/base/GeckoAppShell.java
@@ -428,9 +428,6 @@ public class GeckoAppShell
         f = Environment.getDownloadCacheDirectory();
         GeckoAppShell.putenv("EXTERNAL_STORAGE=" + f.getPath());
 
-        // Enable fixed position layers
-        GeckoAppShell.putenv("MOZ_ENABLE_FIXED_POSITION_LAYERS=1");
-
         // setup the app-specific cache path
         f = context.getCacheDir();
         GeckoAppShell.putenv("CACHE_DIRECTORY=" + f.getPath());