--- a/browser/components/customizableui/CustomizableWidgets.jsm
+++ b/browser/components/customizableui/CustomizableWidgets.jsm
@@ -1207,28 +1207,19 @@ if (Services.prefs.getBoolPref("privacy.
     onViewHiding: function(aEvent) {
       let forgetButton = aEvent.target.querySelector("#PanelUI-panic-view-button");
       forgetButton.removeEventListener("command", this);
     },
   });
 }
 
 if (AppConstants.E10S_TESTING_ONLY) {
-  var e10sDisabled = false;
-
-  if (AppConstants.platform == "macosx") {
-    // On OS X, "Disable Hardware Acceleration" also disables OMTC and forces
-    // a fallback to Basic Layers. This is incompatible with e10s.
-    e10sDisabled |= Services.prefs.getBoolPref("layers.acceleration.disabled");
-  }
-
   if (Services.appinfo.browserTabsRemoteAutostart) {
     CustomizableWidgets.push({
       id: "e10s-button",
-      disabled: e10sDisabled,
       defaultArea: CustomizableUI.AREA_PANEL,
       onBuild: function(aDocument) {
           node.setAttribute("label", CustomizableUI.getLocalizedProperty(this, "label"));
           node.setAttribute("tooltiptext", CustomizableUI.getLocalizedProperty(this, "tooltiptext"));
       },
       onCommand: function(aEvent) {
         let win = aEvent.view;
         if (win && typeof win.OpenBrowserWindow == "function") {

--- a/toolkit/xre/nsAppRunner.cpp
+++ b/toolkit/xre/nsAppRunner.cpp
@@ -86,17 +86,16 @@
 #include "nsIXULAppInfo.h"
 #include "nsIXULRuntime.h"
 #include "nsPIDOMWindow.h"
 #include "nsIBaseWindow.h"
 #include "nsIWidget.h"
 #include "nsIDocShell.h"
 #include "nsAppShellCID.h"
 #include "mozilla/scache/StartupCache.h"
-#include "nsIGfxInfo.h"
 #include "gfxPrefs.h"
 
 #include "base/histogram.h"
 
 #include "mozilla/unused.h"
 
 #ifdef XP_WIN
 #include "nsIWinAppHelper.h"
@@ -4629,17 +4628,17 @@ XRE_IsContentProcess()
 
 // If you add anything to this enum, please update about:support to reflect it
 enum {
   kE10sEnabledByUser = 0,
   kE10sEnabledByDefault = 1,
   kE10sDisabledByUser = 2,
   // kE10sDisabledInSafeMode = 3, was removed in bug 1172491.
   kE10sDisabledForAccessibility = 4,
-  kE10sDisabledForMacGfx = 5,
+  // kE10sDisabledForMacGfx = 5, was removed in bug 1068674.
   kE10sDisabledForBidi = 6,
   kE10sDisabledForAddons = 7,
   kE10sForceDisabled = 8,
 };
 
 #ifdef XP_WIN
 const char* kAccessibilityLastRunDatePref = "accessibility.lastLoadDate";
 const char* kAccessibilityLoadedLastSessionPref = "accessibility.loadedInLastSession";
@@ -4728,51 +4727,16 @@ MultiprocessBlockPolicy() {
   }
 
   if (disabledForBidi) {
     gMultiprocessBlockPolicy = kE10sDisabledForBidi;
     return gMultiprocessBlockPolicy;
   }
 
 
-#if defined(XP_MACOSX)
-  // If for any reason we suspect acceleration will be disabled, disable
-  // e10s auto start on mac.
-
-  // Check prefs
-  bool accelDisabled = gfxPrefs::GetSingleton().LayersAccelerationDisabled() &&
-                       !gfxPrefs::LayersAccelerationForceEnabled();
-
-  accelDisabled = accelDisabled || !nsCocoaFeatures::AccelerateByDefault();
-
-  // Check for blocked drivers
-  if (!accelDisabled) {
-    nsCOMPtr<nsIGfxInfo> gfxInfo = services::GetGfxInfo();
-    if (gfxInfo) {
-      int32_t status;
-      if (NS_SUCCEEDED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_OPENGL_LAYERS, &status)) &&
-          status != nsIGfxInfo::FEATURE_STATUS_OK) {
-        accelDisabled = true;
-      }
-    }
-  }
-
-  // Check env flags
-  if (accelDisabled) {
-    const char *acceleratedEnv = PR_GetEnv("MOZ_ACCELERATED");
-    if (acceleratedEnv && (*acceleratedEnv != '0')) {
-      accelDisabled = false;
-    }
-  }
-
-  if (accelDisabled) {
-    gMultiprocessBlockPolicy = kE10sDisabledForMacGfx;
-    return gMultiprocessBlockPolicy;
-  }
-#endif // defined(XP_MACOSX)
 
   /*
    * None of the blocking policies matched, so e10s is allowed to run.
    * Cache the information and return 0, indicating success.
    */
   gMultiprocessBlockPolicy = 0;
   return 0;
 }