diff --git a/content/base/src/nsDOMBlobBuilder.h b/content/base/src/nsDOMBlobBuilder.h
index d60582597373..4d1bd6fdfb39 100644
--- a/content/base/src/nsDOMBlobBuilder.h
+++ b/content/base/src/nsDOMBlobBuilder.h
@@ -25,7 +25,7 @@ public:
   }
 
   // Create as a blob
-  nsDOMMultipartFile(nsTArray<nsCOMPtr<nsIDOMBlob> > aBlobs,
+  nsDOMMultipartFile(nsTArray<nsCOMPtr<nsIDOMBlob> >& aBlobs,
                      const nsAString& aContentType)
     : nsDOMFile(aContentType, UINT64_MAX),
       mBlobs(aBlobs)
diff --git a/content/events/src/nsDOMTouchEvent.cpp b/content/events/src/nsDOMTouchEvent.cpp
index e0e533c108e5..4175dcb5acd5 100644
--- a/content/events/src/nsDOMTouchEvent.cpp
+++ b/content/events/src/nsDOMTouchEvent.cpp
@@ -288,7 +288,7 @@ nsDOMTouchEvent::GetTouches(nsIDOMTouchList** aTouches)
   if (mEvent->message == NS_TOUCH_END || mEvent->message == NS_TOUCH_CANCEL) {
     // for touchend events, remove any changed touches from the touches array
     nsTArray<nsCOMPtr<nsIDOMTouch> > unchangedTouches;
-    nsTArray<nsCOMPtr<nsIDOMTouch> > touches = touchEvent->touches;
+    const nsTArray<nsCOMPtr<nsIDOMTouch> >& touches = touchEvent->touches;
     for (uint32_t i = 0; i < touches.Length(); ++i) {
       if (!touches[i]->mChanged) {
         unchangedTouches.AppendElement(touches[i]);
@@ -314,7 +314,7 @@ nsDOMTouchEvent::GetTargetTouches(nsIDOMTouchList** aTargetTouches)
 
   nsTArray<nsCOMPtr<nsIDOMTouch> > targetTouches;
   nsTouchEvent* touchEvent = static_cast<nsTouchEvent*>(mEvent);
-  nsTArray<nsCOMPtr<nsIDOMTouch> > touches = touchEvent->touches;
+  const nsTArray<nsCOMPtr<nsIDOMTouch> >& touches = touchEvent->touches;
   for (uint32_t i = 0; i < touches.Length(); ++i) {
     // for touchend/cancel events, don't append to the target list if this is a
     // touch that is ending
@@ -342,7 +342,7 @@ nsDOMTouchEvent::GetChangedTouches(nsIDOMTouchList** aChangedTouches)
 
   nsTArray<nsCOMPtr<nsIDOMTouch> > changedTouches;
   nsTouchEvent* touchEvent = static_cast<nsTouchEvent*>(mEvent);
-  nsTArray<nsCOMPtr<nsIDOMTouch> > touches = touchEvent->touches;
+  const nsTArray<nsCOMPtr<nsIDOMTouch> >& touches = touchEvent->touches;
   for (uint32_t i = 0; i < touches.Length(); ++i) {
     if (touches[i]->mChanged) {
       changedTouches.AppendElement(touches[i]);
diff --git a/content/html/content/src/nsHTMLFormElement.cpp b/content/html/content/src/nsHTMLFormElement.cpp
index 66ed7e08a01f..36c8b4a2d5b2 100644
--- a/content/html/content/src/nsHTMLFormElement.cpp
+++ b/content/html/content/src/nsHTMLFormElement.cpp
@@ -452,7 +452,7 @@ nsHTMLFormElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
 }
 
 static void
-MarkOrphans(const nsTArray<nsGenericHTMLFormElement*> aArray)
+MarkOrphans(const nsTArray<nsGenericHTMLFormElement*>& aArray)
 {
   uint32_t length = aArray.Length();
   for (uint32_t i = 0; i < length; ++i) {
@@ -461,7 +461,8 @@ MarkOrphans(const nsTArray<nsGenericHTMLFormElement*> aArray)
 }
 
 static void
-CollectOrphans(nsINode* aRemovalRoot, nsTArray<nsGenericHTMLFormElement*> aArray
+CollectOrphans(nsINode* aRemovalRoot,
+               const nsTArray<nsGenericHTMLFormElement*>& aArray
 #ifdef DEBUG
                , nsIDOMHTMLFormElement* aThisForm
 #endif