diff --git a/mozilla/widget/src/cocoa/nsChildView.mm b/mozilla/widget/src/cocoa/nsChildView.mm
index 1ab1783c0f7..9671c5944bd 100644
--- a/mozilla/widget/src/cocoa/nsChildView.mm
+++ b/mozilla/widget/src/cocoa/nsChildView.mm
@@ -101,13 +101,6 @@ static void blinkRgn(RgnHandle rgn);
 nsIRollupListener * gRollupListener = nsnull;
 nsIWidget         * gRollupWidget   = nsnull;
 
-// This mask is only defined on 10.4 and up.
-#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_4
-enum {
-  NSDeviceIndependentModifierFlagsMask = 0xffff0000U
-};
-#endif
-
 
 @interface ChildView(Private)
 
@@ -1706,9 +1699,6 @@ NS_IMETHODIMP nsChildView::GetToggledKeyState(PRUint32 aKeyCode,
       key = alphaLock;
       break;
     case NS_VK_NUM_LOCK:
-      // 10.3 doesn't return the NUM_LOCK state.
-      if (nsToolkit::OSXVersion() < MAC_OS_X_VERSION_10_4_HEX)
-        return NS_ERROR_NOT_IMPLEMENTED;
       key = kEventKeyModifierNumLockMask;
       break;
     // Mac doesn't support SCROLL_LOCK state.
@@ -2353,7 +2343,7 @@ NSEvent* globalDragEvent = nil;
 }
 
 
-// A panther-only method, allows us to turn off setting up the clip region
+// Allows us to turn off setting up the clip region
 // before each drawRect. We already clip within gecko.
 - (BOOL)wantsDefaultClipping
 {
diff --git a/mozilla/widget/src/cocoa/nsDeviceContextSpecX.mm b/mozilla/widget/src/cocoa/nsDeviceContextSpecX.mm
index 0506e0aabbc..834e3cc8d74 100644
--- a/mozilla/widget/src/cocoa/nsDeviceContextSpecX.mm
+++ b/mozilla/widget/src/cocoa/nsDeviceContextSpecX.mm
@@ -54,18 +54,6 @@
 #include "gfxQuartzSurface.h"
 #include "gfxImageSurface.h"
 
-// These symbols don't exist on 10.3, but we use them on 10.4 and greater
-#if MAC_OS_X_VERSION_MAX_ALLOWED < MAX_OS_X_VERSION_10_4
-extern PMSessionGetCGGraphicsContext(PMPrintSession, CGContextRef *);
-extern PMSessionBeginCGDocumentNoDialog(PMPrintSession, PMPrintSettings, PMPageFormat);
-#endif
-
-// These functions don't exist on 10.3, which we build against. However, we want to be able to use them on
-// 10.4, so we need to access them at runtime.
-typedef OSStatus (*fpPMSessionBeginCGDocumentNoDialog_type)(PMPrintSession, PMPrintSettings, PMPageFormat);
-typedef OSStatus (*fpPMSessionGetCGGraphicsContext_type)(PMPrintSession, CGContextRef*);
-static fpPMSessionBeginCGDocumentNoDialog_type fpPMSessionBeginCGDocumentNoDialog = NULL;
-static fpPMSessionGetCGGraphicsContext_type fpPMSessionGetCGGraphicsContext = NULL;
 
 /** -------------------------------------------------------
  *  Construct the nsDeviceContextSpecX
@@ -77,16 +65,6 @@ nsDeviceContextSpecX::nsDeviceContextSpecX()
 , mPrintSettings(kPMNoPrintSettings)
 , mBeganPrinting(PR_FALSE)
 {
-    //We have to load these at runtime to use them on 10.4, since we build against 10.3.
-    if (nsToolkit::OnTigerOrLater()) {
-        CFBundleRef bundle = ::CFBundleGetBundleWithIdentifier(CFSTR("com.apple.ApplicationServices"));
-        if (bundle) {
-            fpPMSessionBeginCGDocumentNoDialog = (fpPMSessionBeginCGDocumentNoDialog_type)
-              ::CFBundleGetFunctionPointerForName(bundle, CFSTR("PMSessionBeginCGDocumentNoDialog"));
-            fpPMSessionGetCGGraphicsContext = (fpPMSessionGetCGGraphicsContext_type)
-              ::CFBundleGetFunctionPointerForName(bundle, CFSTR("PMSessionGetCGGraphicsContext"));
-        }
-    }
 }
 
 /** -------------------------------------------------------
@@ -100,11 +78,8 @@ nsDeviceContextSpecX::~nsDeviceContextSpecX()
   ClosePrintManager();
 }
 
-#ifdef MOZ_CAIRO_GFX
 NS_IMPL_ISUPPORTS1(nsDeviceContextSpecX, nsIDeviceContextSpec)
-#else
-NS_IMPL_ISUPPORTS2(nsDeviceContextSpecX, nsIDeviceContextSpec, nsIPrintingContext)
-#endif
+
 /** -------------------------------------------------------
  *  Initialize the nsDeviceContextSpecMac
  *  @update   dc 12/02/98
@@ -173,26 +148,9 @@ NS_IMETHODIMP nsDeviceContextSpecX::BeginDocument(PRUnichar*  aTitle,
     status = ::PMSetLastPage(mPrintSettings, aEndPage, false);
     NS_ASSERTION(status == noErr, "PMSetLastPage failed");
 
-    if (nsToolkit::OnTigerOrLater() && fpPMSessionBeginCGDocumentNoDialog) {
-        //On 10.4 and above, we can easily use CoreGraphics
-        status = fpPMSessionBeginCGDocumentNoDialog(mPrintSession, mPrintSettings, mPageFormat);
-    } else {
-        //Not so on 10.3. The following (taken from Apple sample code) allows us to get a CGContextRef later on 10.3
-        CFStringRef strings[1];
-        CFArrayRef graphicsContextsArray;
-
-        strings[0] = kPMGraphicsContextCoreGraphics;
-        graphicsContextsArray = ::CFArrayCreate(kCFAllocatorDefault, (const void **)strings, 1, &kCFTypeArrayCallBacks);
-
-        if (graphicsContextsArray != NULL) {
-            ::PMSessionSetDocumentFormatGeneration(mPrintSession, kPMDocumentFormatPDF, graphicsContextsArray, NULL);
-            ::CFRelease(graphicsContextsArray);
-        }
-        //Actually create the document
-        status = ::PMSessionBeginDocumentNoDialog(mPrintSession, mPrintSettings, mPageFormat);
-    }
-    
-    if (status != noErr) return NS_ERROR_ABORT;
+    status = ::PMSessionBeginCGDocumentNoDialog(mPrintSession, mPrintSettings, mPageFormat);
+    if (status != noErr)
+      return NS_ERROR_ABORT;
 
     return NS_OK;
 }
@@ -258,14 +216,9 @@ NS_IMETHODIMP nsDeviceContextSpecX::GetSurfaceForPrinter(gfxASurface **surface)
     const double width = right - left;
     const double height = bottom - top;
 
-    //On 10.4 or later, just use CG natively. On 10.3, though, we have to request CG specifically.
     CGContextRef context;
-    if (nsToolkit::OnTigerOrLater() && fpPMSessionGetCGGraphicsContext) {
-        fpPMSessionGetCGGraphicsContext(mPrintSession, &context);
-    } else {
-        ::PMSessionGetGraphicsContext(mPrintSession, kPMGraphicsContextCoreGraphics, (void **)&context);
-    }
-    
+    ::PMSessionGetCGGraphicsContext(mPrintSession, &context);
+
     nsRefPtr<gfxASurface> newSurface;
 
     if (context) {
diff --git a/mozilla/widget/src/cocoa/nsMenuX.mm b/mozilla/widget/src/cocoa/nsMenuX.mm
index 518d0cf4635..d7aa7151f4c 100644
--- a/mozilla/widget/src/cocoa/nsMenuX.mm
+++ b/mozilla/widget/src/cocoa/nsMenuX.mm
@@ -1207,9 +1207,7 @@ static pascal OSStatus MyMenuEventHandler(EventHandlerCallRef myHandler, EventRe
   else if (kind == kEventMenuOpening || kind == kEventMenuClosed) {
     if (kind == kEventMenuOpening && gRollupListener != nsnull && gRollupWidget != nsnull) {
       gRollupListener->Rollup();
-      // returning userCanceledErr crashes on Panther. See bug 351230.
-      if (nsToolkit::OnTigerOrLater())
-        return userCanceledErr;
+      return userCanceledErr;
     }
     
     nsISupports* supports = reinterpret_cast<nsISupports*>(userData);
@@ -1273,7 +1271,7 @@ static OSStatus InstallMyMenuEventHandler(MenuRef menuRef, void* userData, Event
 // and that doesn't work for us. We don't need any carbon events until after the
 // first time the menu is shown, so when that happens we install the carbon
 // event handler. This works because at this point we can get a MenuRef without
-// much trouble. This call is 10.3+, so this stuff won't work on 10.2.x or less.
+// much trouble.
 - (void)menuNeedsUpdate:(NSMenu*)aMenu
 {
   if (!mHaveInstalledCarbonEvents) {
diff --git a/mozilla/widget/src/cocoa/nsNativeThemeCocoa.mm b/mozilla/widget/src/cocoa/nsNativeThemeCocoa.mm
index 1ef9f8d66f7..5fc126fac67 100644
--- a/mozilla/widget/src/cocoa/nsNativeThemeCocoa.mm
+++ b/mozilla/widget/src/cocoa/nsNativeThemeCocoa.mm
@@ -184,16 +184,11 @@ nsNativeThemeCocoa::DrawButton(CGContextRef cgContext, ThemeButtonKind inKind,
     [image setSize:NSMakeSize(inBoxRect.size.width, inBoxRect.size.height)];
 
     // render to the given CGContextRef
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
-    // graphicsContextWithGraphicsPort is only available on 10.4+
     [NSGraphicsContext saveGraphicsState];
     [NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithGraphicsPort:cgContext flipped:YES]];
-#endif
     [image compositeToPoint:NSMakePoint(inBoxRect.origin.x, inBoxRect.origin.y + inBoxRect.size.height)
                   operation:NSCompositeSourceOver];
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
     [NSGraphicsContext restoreGraphicsState];
-#endif
     [image release];
   }
   else {
diff --git a/mozilla/widget/src/cocoa/nsToolkit.h b/mozilla/widget/src/cocoa/nsToolkit.h
index 2c2aea76b70..f217d51c3a7 100644
--- a/mozilla/widget/src/cocoa/nsToolkit.h
+++ b/mozilla/widget/src/cocoa/nsToolkit.h
@@ -67,8 +67,6 @@
  * per nsToolkit.
  */
 
-#define MAC_OS_X_VERSION_10_2_HEX 0x00001020
-#define MAC_OS_X_VERSION_10_3_HEX 0x00001030
 #define MAC_OS_X_VERSION_10_4_HEX 0x00001040
 #define MAC_OS_X_VERSION_10_5_HEX 0x00001050
 
@@ -85,8 +83,6 @@ public:
   static long        OSXVersion();
   
   // Convenience functions to check the OS version
-  static PRBool      OnPantherOrLater();
-  static PRBool      OnTigerOrLater();
   static PRBool      OnLeopardOrLater();
   
   static void        PostSleepWakeNotification(const char* aNotification);
diff --git a/mozilla/widget/src/cocoa/nsToolkit.mm b/mozilla/widget/src/cocoa/nsToolkit.mm
index 120209b5519..482d9dd3eaf 100644
--- a/mozilla/widget/src/cocoa/nsToolkit.mm
+++ b/mozilla/widget/src/cocoa/nsToolkit.mm
@@ -359,22 +359,13 @@ long nsToolkit::OSXVersion()
     OSErr err = ::Gestalt(gestaltSystemVersion, &gOSXVersion);
     if (err != noErr) {
       //This should probably be changed when our minimum version changes
-      NS_ERROR("Couldn't determine OS X version, assuming 10.3");
-      gOSXVersion = MAC_OS_X_VERSION_10_3_HEX;
+      NS_ERROR("Couldn't determine OS X version, assuming 10.4");
+      gOSXVersion = MAC_OS_X_VERSION_10_4_HEX;
     }
   }
   return gOSXVersion;
 }
 
-PRBool nsToolkit::OnPantherOrLater()
-{
-    return (OSXVersion() >= MAC_OS_X_VERSION_10_3_HEX) ? PR_TRUE : PR_FALSE;
-}
-
-PRBool nsToolkit::OnTigerOrLater()
-{
-    return (OSXVersion() >= MAC_OS_X_VERSION_10_4_HEX) ? PR_TRUE : PR_FALSE;
-}
 
 PRBool nsToolkit::OnLeopardOrLater()
 {