diff --git a/widget/src/mac/nsMacWindow.cpp b/widget/src/mac/nsMacWindow.cpp
index ffd17c3cb990..2fbe95cee5c2 100644
--- a/widget/src/mac/nsMacWindow.cpp
+++ b/widget/src/mac/nsMacWindow.cpp
@@ -431,7 +431,7 @@ nsresult nsMacWindow::StandardCreate(nsIWidget *aParent,
         // XXX kWindowDoesNotCycleAttribute is only defined in the 10.3 (or
         //     higher) SDK but MacWindows.h claims it should work on 10.2
         //     and higher.
-        if (nsToolkit::OSXVersion() > MAC_OS_X_VERSION_10_2)
+        if (nsToolkit::OSXVersion() >= MAC_OS_X_VERSION_10_2_HEX)
         {
           attributes = (1L << 15); // kWindowDoesNotCycleAttribute
         }
@@ -459,7 +459,7 @@ nsresult nsMacWindow::StandardCreate(nsIWidget *aParent,
                                  wRect.right - wRect.left, wRect.bottom - wRect.top,
                                  getter_AddRefs(screen));
       if (screen) {
-          PRInt32 left, top, width, height;
+        PRInt32 left, top, width, height;
         screen->GetAvailRect(&left, &top, &width, &height);
         if (wRect.bottom > top+height) {
           bottomPinDelta = wRect.bottom - (top+height);
@@ -468,18 +468,7 @@ nsresult nsMacWindow::StandardCreate(nsIWidget *aParent,
       }
     }
 
-    // XXX Need to special-case for OS X versions below 10.1, because
-    //     kSimpleWindowClass doesn't exist.
-    if (mWindowType == eWindowType_popup &&
-        nsToolkit::OSXVersion() < MAC_OS_X_VERSION_10_1)
-    {
-      mWindowPtr = ::NewCWindow(nil, &wRect, "\p", false, kWindowSimpleProc,
-                                (WindowRef)-1, false, (long)nsnull);
-    }
-    else
-    {
-      ::CreateNewWindow(windowClass, attributes, &wRect, &mWindowPtr);
-    }
+    ::CreateNewWindow(windowClass, attributes, &wRect, &mWindowPtr);
 
     mWindowMadeHere = PR_TRUE;
 
@@ -1437,7 +1426,6 @@ NS_IMETHODIMP nsMacWindow::Resize(PRInt32 aWidth, PRInt32 aHeight, PRBool aRepai
 
     short w = macRect.right - macRect.left;
     short h = macRect.bottom - macRect.top;
-    Boolean needReposition = (w == 1 && h == 1);
 
     if ((w != aWidth) || (h != aHeight))
     {
@@ -1455,12 +1443,6 @@ NS_IMETHODIMP nsMacWindow::Resize(PRInt32 aWidth, PRInt32 aHeight, PRBool aRepai
       }
 
       mResizeIsFromUs = PR_FALSE;
-
-#if defined(XP_MACOSX)
-      // workaround for bug in MacOSX if windows start life as 1x1.
-      if (needReposition)
-        RepositionWindow(mWindowPtr, NULL, kWindowCascadeOnMainScreen);
-#endif
     }
   }
   Inherited::Resize(aWidth, aHeight, aRepaint);
diff --git a/widget/src/mac/nsToolkit.cpp b/widget/src/mac/nsToolkit.cpp
index b0347611ab92..afa2de94bc08 100644
--- a/widget/src/mac/nsToolkit.cpp
+++ b/widget/src/mac/nsToolkit.cpp
@@ -268,7 +268,7 @@ nsToolkit :: OSXVersion()
     OSErr err = ::Gestalt(gestaltSystemVersion, &gOSXVersion);
     if (err != noErr) {
       NS_ERROR("Couldn't determine OS X version, assume 10.0");
-      gOSXVersion = MAC_OS_X_VERSION_10_0;
+      gOSXVersion = MAC_OS_X_VERSION_10_0_HEX;
     }
   }
   return gOSXVersion;
diff --git a/widget/src/mac/nsToolkit.h b/widget/src/mac/nsToolkit.h
index 6456fbee3e93..d3f287698abf 100644
--- a/widget/src/mac/nsToolkit.h
+++ b/widget/src/mac/nsToolkit.h
@@ -76,6 +76,10 @@
 class nsIEventSink;
 class nsIWidget;
 
+#define MAC_OS_X_VERSION_10_0_HEX 0x00001000
+#define MAC_OS_X_VERSION_10_1_HEX 0x00001010
+#define MAC_OS_X_VERSION_10_2_HEX 0x00001020
+#define MAC_OS_X_VERSION_10_3_HEX 0x00001030
 
 class nsToolkit : public nsToolkitBase
 {
diff --git a/widget/src/mac/nsWindow.cpp b/widget/src/mac/nsWindow.cpp
index c5dddaf90e15..799a204f0c20 100644
--- a/widget/src/mac/nsWindow.cpp
+++ b/widget/src/mac/nsWindow.cpp
@@ -701,7 +701,8 @@ PRBool OnJaguarOrLater() // Return true if we are on Mac OS X 10.2 or later
     static PRBool gOnJaguarOrLater = PR_FALSE;
     if(!gInitVer)
     {
-        gOnJaguarOrLater = (nsToolkit::OSXVersion() >= MAC_OS_X_VERSION_10_2);
+        gOnJaguarOrLater =
+            (nsToolkit::OSXVersion() >= MAC_OS_X_VERSION_10_2_HEX);
         gInitVer = PR_TRUE;
     }
     return gOnJaguarOrLater;
@@ -713,7 +714,8 @@ PRBool OnPantherOrLater() // Return true if we are on Mac OS X 10.3 or later
     static PRBool gOnPantherOrLater = PR_FALSE;
     if(!gInitVer1030)
     {
-        gOnPantherOrLater = (nsToolkit::OSXVersion() >= 0x00001030);
+        gOnPantherOrLater =
+            (nsToolkit::OSXVersion() >= MAC_OS_X_VERSION_10_3_HEX);
         gInitVer1030 = PR_TRUE;
     }
     return gOnPantherOrLater;