diff --git a/mozilla/layout/base/nsPresShell.cpp b/mozilla/layout/base/nsPresShell.cpp
index 30a12bcb5db..603ec49e434 100644
--- a/mozilla/layout/base/nsPresShell.cpp
+++ b/mozilla/layout/base/nsPresShell.cpp
@@ -3444,10 +3444,10 @@ SetClipRect(nsIRenderingContext& aRenderingContext, nsIFrame* aFrame)
         clipRect.x = display->mClip.x;
       }
       if (0 == (NS_STYLE_CLIP_RIGHT_AUTO & display->mClipFlags)) {
-        clipRect.width = clipRect.x + display->mClip.width;
+        clipRect.width = display->mClip.width;
       }
       if (0 == (NS_STYLE_CLIP_BOTTOM_AUTO & display->mClipFlags)) {
-        clipRect.height = clipRect.y + display->mClip.height;
+        clipRect.height = display->mClip.height;
       }
     }
 
diff --git a/mozilla/layout/generic/nsContainerFrame.cpp b/mozilla/layout/generic/nsContainerFrame.cpp
index 168d839c4b2..2586a8a16e9 100644
--- a/mozilla/layout/generic/nsContainerFrame.cpp
+++ b/mozilla/layout/generic/nsContainerFrame.cpp
@@ -590,10 +590,10 @@ nsContainerFrame::SyncFrameViewAfterReflow(nsIPresContext* aPresContext,
             clipRect.x = display->mClip.x;
           }
           if (0 == (NS_STYLE_CLIP_RIGHT_AUTO & display->mClipFlags)) {
-            clipRect.width = clipRect.x + display->mClip.width;
+            clipRect.width = display->mClip.width;
           }
           if (0 == (NS_STYLE_CLIP_BOTTOM_AUTO & display->mClipFlags)) {
-            clipRect.height = clipRect.y + display->mClip.height;
+            clipRect.height = display->mClip.height;
           }
         }
       }
diff --git a/mozilla/layout/html/base/src/nsContainerFrame.cpp b/mozilla/layout/html/base/src/nsContainerFrame.cpp
index 168d839c4b2..2586a8a16e9 100644
--- a/mozilla/layout/html/base/src/nsContainerFrame.cpp
+++ b/mozilla/layout/html/base/src/nsContainerFrame.cpp
@@ -590,10 +590,10 @@ nsContainerFrame::SyncFrameViewAfterReflow(nsIPresContext* aPresContext,
             clipRect.x = display->mClip.x;
           }
           if (0 == (NS_STYLE_CLIP_RIGHT_AUTO & display->mClipFlags)) {
-            clipRect.width = clipRect.x + display->mClip.width;
+            clipRect.width = display->mClip.width;
           }
           if (0 == (NS_STYLE_CLIP_BOTTOM_AUTO & display->mClipFlags)) {
-            clipRect.height = clipRect.y + display->mClip.height;
+            clipRect.height = display->mClip.height;
           }
         }
       }
diff --git a/mozilla/layout/html/base/src/nsPresShell.cpp b/mozilla/layout/html/base/src/nsPresShell.cpp
index 30a12bcb5db..603ec49e434 100644
--- a/mozilla/layout/html/base/src/nsPresShell.cpp
+++ b/mozilla/layout/html/base/src/nsPresShell.cpp
@@ -3444,10 +3444,10 @@ SetClipRect(nsIRenderingContext& aRenderingContext, nsIFrame* aFrame)
         clipRect.x = display->mClip.x;
       }
       if (0 == (NS_STYLE_CLIP_RIGHT_AUTO & display->mClipFlags)) {
-        clipRect.width = clipRect.x + display->mClip.width;
+        clipRect.width = display->mClip.width;
       }
       if (0 == (NS_STYLE_CLIP_BOTTOM_AUTO & display->mClipFlags)) {
-        clipRect.height = clipRect.y + display->mClip.height;
+        clipRect.height = display->mClip.height;
       }
     }