--- a/widget/cocoa/nsNativeThemeCocoa.mm
+++ b/widget/cocoa/nsNativeThemeCocoa.mm
@@ -2268,20 +2268,20 @@ nsNativeThemeCocoa::IsParentScrollbarRol
 {
   nsIFrame* scrollbarFrame = GetParentScrollbarFrame(aFrame);
   return nsLookAndFeel::UseOverlayScrollbars()
     ? CheckBooleanAttr(scrollbarFrame, nsGkAtoms::hover)
     : GetContentState(scrollbarFrame, NS_THEME_NONE).HasState(NS_EVENT_STATE_HOVER);
 }
 
 static bool
-IsHiDPIContext(nsPresContext* aContext)
+IsHiDPIContext(nsDeviceContext* aContext)
 {
   return nsPresContext::AppUnitsPerCSSPixel() >=
-    2 * aContext->DeviceContext()->AppUnitsPerDevPixelAtUnitFullZoom();
+    2 * aContext->AppUnitsPerDevPixelAtUnitFullZoom();
 }
 
 NS_IMETHODIMP
 nsNativeThemeCocoa::DrawWidgetBackground(nsRenderingContext* aContext,
                                          nsIFrame* aFrame,
                                          uint8_t aWidgetType,
                                          const nsRect& aRect,
                                          const nsRect& aDirtyRect)
@@ -2306,17 +2306,17 @@ nsNativeThemeCocoa::DrawWidgetBackground
   // sure our surface is big enough for that.
   // For example, DrawCellWithSnapping snaps the drawing rect, and that can
   // result in us drawing outside of what we thought the bounds were.
   // The 5 is just a guess of how much margin we need to handle that.
   nativeDirtyRect.Inflate(5);
 
   AutoRestoreTransform autoRestoreTransform(&aDrawTarget);
 
-  bool hidpi = IsHiDPIContext(aFrame->PresContext());
+  bool hidpi = IsHiDPIContext(aFrame->PresContext()->DeviceContext());
   if (hidpi) {
     // Use high-resolution drawing.
     nativeWidgetRect.Scale(0.5f);
     nativeWidgetHeight *= 0.5f;
     nativeDirtyRect.Scale(0.5f);
     aDrawTarget.SetTransform(aDrawTarget.GetTransform().PreScale(2.0f, 2.0f));
   }
 
@@ -3088,17 +3088,17 @@ nsNativeThemeCocoa::GetWidgetBorder(nsDe
       break;
     }
 
     case NS_THEME_STATUSBAR:
       aResult->SizeTo(1, 0, 0, 0);
       break;
   }
 
-  if (IsHiDPIContext(aFrame->PresContext())) {
+  if (IsHiDPIContext(aContext)) {
     *aResult = *aResult + *aResult; // doubled
   }
 
   return NS_OK;
 
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 
@@ -3125,17 +3125,17 @@ nsNativeThemeCocoa::GetWidgetPadding(nsD
   }
   return false;
 }
 
 bool
 nsNativeThemeCocoa::GetWidgetOverflow(nsDeviceContext* aContext, nsIFrame* aFrame,
                                       uint8_t aWidgetType, nsRect* aOverflowRect)
 {
-  int32_t p2a = aFrame->PresContext()->AppUnitsPerDevPixel();
+  nsIntMargin overflow;
   switch (aWidgetType) {
     case NS_THEME_BUTTON:
     case NS_THEME_MAC_DISCLOSURE_BUTTON_OPEN:
     case NS_THEME_MAC_DISCLOSURE_BUTTON_CLOSED:
     case NS_THEME_MAC_HELP_BUTTON:
     case NS_THEME_TOOLBARBUTTON:
     case NS_THEME_NUMBER_INPUT:
     case NS_THEME_TEXTFIELD:
@@ -3143,42 +3143,50 @@ nsNativeThemeCocoa::GetWidgetOverflow(ns
     case NS_THEME_SEARCHFIELD:
     case NS_THEME_LISTBOX:
     case NS_THEME_MENULIST:
     case NS_THEME_MENULIST_BUTTON:
     case NS_THEME_MENULIST_TEXTFIELD:
     case NS_THEME_CHECKBOX:
     case NS_THEME_RADIO:
     case NS_THEME_TAB:
+    case NS_THEME_FOCUS_OUTLINE:
     {
-      // We assume that the above widgets can draw a focus ring that will be less than
-      // or equal to 4 pixels thick.
-      nsIntMargin extraSize = nsIntMargin(kMaxFocusRingWidth,
-                                          kMaxFocusRingWidth,
-                                          kMaxFocusRingWidth,
-                                          kMaxFocusRingWidth);
-      nsMargin m(NSIntPixelsToAppUnits(extraSize.top, p2a),
-                 NSIntPixelsToAppUnits(extraSize.right, p2a),
-                 NSIntPixelsToAppUnits(extraSize.bottom, p2a),
-                 NSIntPixelsToAppUnits(extraSize.left, p2a));
-      aOverflowRect->Inflate(m);
-      return true;
+      overflow.SizeTo(kMaxFocusRingWidth,
+                      kMaxFocusRingWidth,
+                      kMaxFocusRingWidth,
+                      kMaxFocusRingWidth);
+      break;
     }
     case NS_THEME_PROGRESSBAR:
     {
-      // Progress bars draw a 2 pixel white shadow under their progress indicators
-      nsMargin m(0, 0, NSIntPixelsToAppUnits(2, p2a), 0);
-      aOverflowRect->Inflate(m);
-      return true;
+      // Progress bars draw a 2 pixel white shadow under their progress indicators.
+      overflow.bottom = 2;
+      break;
+    }
+    case NS_THEME_METERBAR:
+    {
+      // Meter bars overflow their boxes by about 2 pixels.
+      overflow.SizeTo(2, 2, 2, 2);
+      break;
     }
-    case NS_THEME_FOCUS_OUTLINE:
-    {
-      aOverflowRect->Inflate(NSIntPixelsToAppUnits(2, p2a));
-      return true;
-    }
+  }
+
+  if (IsHiDPIContext(aContext)) {
+    // Double the number of device pixels.
+    overflow += overflow;
+  }
+
+  if (overflow != nsIntMargin()) {
+    int32_t p2a = aFrame->PresContext()->AppUnitsPerDevPixel();
+    aOverflowRect->Inflate(nsMargin(NSIntPixelsToAppUnits(overflow.top, p2a),
+                                    NSIntPixelsToAppUnits(overflow.right, p2a),
+                                    NSIntPixelsToAppUnits(overflow.bottom, p2a),
+                                    NSIntPixelsToAppUnits(overflow.left, p2a)));
+    return true;
   }
 
   return false;
 }
 
 static const int32_t kRegularScrollbarThumbMinSize = 26;
 static const int32_t kSmallScrollbarThumbMinSize = 26;
 
@@ -3492,17 +3500,17 @@ nsNativeThemeCocoa::GetMinimumWidgetSize
       HIPoint pnt = { 0, 0 };
       HIRect bounds;
       HIThemeGetGrowBoxBounds(&pnt, &drawInfo, &bounds);
       aResult->SizeTo(bounds.size.width, bounds.size.height);
       *aIsOverridable = false;
     }
   }
 
-  if (IsHiDPIContext(aPresContext)) {
+  if (IsHiDPIContext(aPresContext->DeviceContext())) {
     *aResult = *aResult * 2;
   }
 
   return NS_OK;
 
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }