diff --git a/dom/ipc/ContentParent.cpp b/dom/ipc/ContentParent.cpp
index aecace1223c..0f582ffcd56 100755
--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -4029,9 +4029,9 @@ ContentParent::RecvGetSystemMemory(const uint64_t& aGetterId)
 }
 
 bool
-ContentParent::RecvGetLookAndFeelCache(nsTArray<LookAndFeelInt>&& aLookAndFeelIntCache)
+ContentParent::RecvGetLookAndFeelCache(nsTArray<LookAndFeelInt>* aLookAndFeelIntCache)
 {
-    aLookAndFeelIntCache = LookAndFeel::GetIntCache();
+    *aLookAndFeelIntCache = LookAndFeel::GetIntCache();
     return true;
 }
 
diff --git a/dom/ipc/ContentParent.h b/dom/ipc/ContentParent.h
index 9404a245602..db41e14dd68 100644
--- a/dom/ipc/ContentParent.h
+++ b/dom/ipc/ContentParent.h
@@ -761,7 +761,7 @@ private:
 
     virtual bool RecvGetSystemMemory(const uint64_t& getterId) override;
 
-    virtual bool RecvGetLookAndFeelCache(nsTArray<LookAndFeelInt>&& aLookAndFeelIntCache) override;
+    virtual bool RecvGetLookAndFeelCache(nsTArray<LookAndFeelInt>* aLookAndFeelIntCache) override;
 
     virtual bool RecvDataStoreGetStores(
                        const nsString& aName,
diff --git a/dom/ipc/PContent.ipdl b/dom/ipc/PContent.ipdl
index 78293fb2c0c..f2cd901ddbc 100644
--- a/dom/ipc/PContent.ipdl
+++ b/dom/ipc/PContent.ipdl
@@ -733,7 +733,8 @@ parent:
     sync IsSecureURI(uint32_t type, URIParams uri, uint32_t flags)
         returns (bool isSecureURI);
 
-    sync GetLookAndFeelCache(LookAndFeelInt[] lookAndFeelIntCache);
+    sync GetLookAndFeelCache()
+        returns (LookAndFeelInt[] lookAndFeelIntCache);
 
     prio(urgent) async PHal();
 
diff --git a/widget/cocoa/nsLookAndFeel.h b/widget/cocoa/nsLookAndFeel.h
index d6734d3dcce..ac23a32f6c1 100644
--- a/widget/cocoa/nsLookAndFeel.h
+++ b/widget/cocoa/nsLookAndFeel.h
@@ -27,7 +27,7 @@ public:
   static bool UseOverlayScrollbars();
 
   virtual nsTArray<LookAndFeelInt> GetIntCacheImpl();
-  virtual void SetIntCacheImpl(const nsTArray<LookAndFeelInt>& lookAndFeelIntCache);
+  virtual void SetIntCacheImpl(const nsTArray<LookAndFeelInt>& aLookAndFeelIntCache);
 
   virtual void RefreshImpl();
 protected:
diff --git a/widget/cocoa/nsLookAndFeel.mm b/widget/cocoa/nsLookAndFeel.mm
index c4bceb53fe6..424f8754162 100644
--- a/widget/cocoa/nsLookAndFeel.mm
+++ b/widget/cocoa/nsLookAndFeel.mm
@@ -668,9 +668,9 @@ nsLookAndFeel::GetIntCacheImpl()
 }
 
 void
-nsLookAndFeel::SetIntCacheImpl(const nsTArray<LookAndFeelInt>& lookAndFeelIntCache)
+nsLookAndFeel::SetIntCacheImpl(const nsTArray<LookAndFeelInt>& aLookAndFeelIntCache)
 {
-  for (auto entry : lookAndFeelIntCache) {
+  for (auto entry : aLookAndFeelIntCache) {
     switch(entry.id) {
       case eIntID_UseOverlayScrollbars:
         mUseOverlayScrollbars = entry.value;
diff --git a/widget/nsXPLookAndFeel.cpp b/widget/nsXPLookAndFeel.cpp
index 43b83e73011..cef5ebf5f89 100644
--- a/widget/nsXPLookAndFeel.cpp
+++ b/widget/nsXPLookAndFeel.cpp
@@ -461,7 +461,7 @@ nsXPLookAndFeel::Init()
       mozilla::dom::ContentChild::GetSingleton();
 
     nsTArray<LookAndFeelInt> lookAndFeelIntCache;
-    cc->SendGetLookAndFeelCache(lookAndFeelIntCache);
+    cc->SendGetLookAndFeelCache(&lookAndFeelIntCache);
     LookAndFeel::SetIntCache(lookAndFeelIntCache);
   }
 }