diff --git a/widget/cocoa/GfxInfo.mm b/widget/cocoa/GfxInfo.mm
index 6081bb108d7..1b01ddbcb10 100644
--- a/widget/cocoa/GfxInfo.mm
+++ b/widget/cocoa/GfxInfo.mm
@@ -30,6 +30,7 @@
 #define MAC_OS_X_VERSION_10_5_HEX   0x00001050
 #define MAC_OS_X_VERSION_10_6_HEX   0x00001060
 #define MAC_OS_X_VERSION_10_7_HEX   0x00001070
+#define MAC_OS_X_VERSION_10_8_HEX   0x00001080
 
 using namespace mozilla;
 using namespace mozilla::widget;
@@ -52,6 +53,8 @@ OSXVersionToOperatingSystem(uint32_t aOSXVersion)
       return DRIVER_OS_OS_X_10_6;
     case MAC_OS_X_VERSION_10_7_HEX:
       return DRIVER_OS_OS_X_10_7;
+    case MAC_OS_X_VERSION_10_8_HEX:
+      return DRIVER_OS_OS_X_10_8;
   }
 
   return DRIVER_OS_UNKNOWN;
diff --git a/widget/windows/GfxInfo.cpp b/widget/windows/GfxInfo.cpp
index 97db474c06a..27a641703cb 100644
--- a/widget/windows/GfxInfo.cpp
+++ b/widget/windows/GfxInfo.cpp
@@ -717,6 +717,8 @@ WindowsVersionToOperatingSystem(int32_t aWindowsVersion)
       return DRIVER_OS_WINDOWS_VISTA;
     case gfxWindowsPlatform::kWindows7:
       return DRIVER_OS_WINDOWS_7;
+    case gfxWindowsPlatform::kWindows8:
+      return DRIVER_OS_WINDOWS_8;
     case gfxWindowsPlatform::kWindowsUnknown:
     default:
       return DRIVER_OS_UNKNOWN;
diff --git a/widget/xpwidgets/GfxDriverInfo.h b/widget/xpwidgets/GfxDriverInfo.h
index 421840967d3..7abd907d4a7 100644
--- a/widget/xpwidgets/GfxDriverInfo.h
+++ b/widget/xpwidgets/GfxDriverInfo.h
@@ -26,10 +26,12 @@ enum OperatingSystem {
   DRIVER_OS_WINDOWS_SERVER_2003,
   DRIVER_OS_WINDOWS_VISTA,
   DRIVER_OS_WINDOWS_7,
+  DRIVER_OS_WINDOWS_8,
   DRIVER_OS_LINUX,
   DRIVER_OS_OS_X_10_5,
   DRIVER_OS_OS_X_10_6,
   DRIVER_OS_OS_X_10_7,
+  DRIVER_OS_OS_X_10_8,
   DRIVER_OS_ANDROID,
   DRIVER_OS_ALL
 };
diff --git a/widget/xpwidgets/GfxInfoBase.cpp b/widget/xpwidgets/GfxInfoBase.cpp
index cf061b6df40..ef386897e96 100644
--- a/widget/xpwidgets/GfxInfoBase.cpp
+++ b/widget/xpwidgets/GfxInfoBase.cpp
@@ -204,6 +204,8 @@ BlacklistOSToOperatingSystem(const nsAString& os)
     return DRIVER_OS_WINDOWS_VISTA;
   else if (os == NS_LITERAL_STRING("WINNT 6.1"))
     return DRIVER_OS_WINDOWS_7;
+  else if (os == NS_LITERAL_STRING("WINNT 6.2"))
+    return DRIVER_OS_WINDOWS_8;
   else if (os == NS_LITERAL_STRING("Linux"))
     return DRIVER_OS_LINUX;
   else if (os == NS_LITERAL_STRING("Darwin 9"))
@@ -212,6 +214,8 @@ BlacklistOSToOperatingSystem(const nsAString& os)
     return DRIVER_OS_OS_X_10_6;
   else if (os == NS_LITERAL_STRING("Darwin 11"))
     return DRIVER_OS_OS_X_10_7;
+  else if (os == NS_LITERAL_STRING("Darwin 12"))
+    return DRIVER_OS_OS_X_10_8;
   else if (os == NS_LITERAL_STRING("Android"))
     return DRIVER_OS_ANDROID;
   else if (os == NS_LITERAL_STRING("All"))