--- a/layout/painting/nsDisplayList.cpp
+++ b/layout/painting/nsDisplayList.cpp
@@ -5817,17 +5817,26 @@ nsRegion
 nsDisplayWrapList::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
                                    bool* aSnap) const
 {
   *aSnap = false;
   nsRegion result;
   if (mListPtr->IsOpaque()) {
     // Everything within GetBounds that's visible is opaque.
     result = GetBounds(aBuilder, aSnap);
-  }
+  } else if (aBuilder->HitTestShouldStopAtFirstOpaque()) {
+    // If we care about an accurate opaque region, iterate the display list
+    // and build up a region of opaque bounds.
+    nsDisplayItem* item = mList.GetBottom();
+    while (item) {
+      result.OrWith(item->GetOpaqueRegion(aBuilder, aSnap));
+      item = item->GetAbove();
+    }
+  }
+  *aSnap = false;
   return result;
 }
 
 Maybe<nscolor>
 nsDisplayWrapList::IsUniform(nsDisplayListBuilder* aBuilder) const
 {
   // We could try to do something but let's conservatively just return Nothing.
   return Nothing();