diff --git a/editor/libeditor/EditAggregateTransaction.cpp b/editor/libeditor/EditAggregateTransaction.cpp
index 5493e649d189..28a59b2d8923 100644
--- a/editor/libeditor/EditAggregateTransaction.cpp
+++ b/editor/libeditor/EditAggregateTransaction.cpp
@@ -22,8 +22,8 @@ NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
 
 NS_IMETHODIMP EditAggregateTransaction::DoTransaction() {
   // FYI: It's legal (but not very useful) to have an empty child list.
-  AutoTArray<OwningNonNull<EditTransactionBase>, 10> children(mChildren);
-  for (OwningNonNull<EditTransactionBase>& childTransaction : children) {
+  for (const OwningNonNull<EditTransactionBase>& childTransaction :
+       CopyableAutoTArray<OwningNonNull<EditTransactionBase>, 10>(mChildren)) {
     nsresult rv = MOZ_KnownLive(childTransaction)->DoTransaction();
     if (NS_FAILED(rv)) {
       NS_WARNING("EditTransactionBase::DoTransaction() failed");
@@ -36,8 +36,9 @@ NS_IMETHODIMP EditAggregateTransaction::DoTransaction() {
 NS_IMETHODIMP EditAggregateTransaction::UndoTransaction() {
   // FYI: It's legal (but not very useful) to have an empty child list.
   // Undo goes through children backwards.
-  AutoTArray<OwningNonNull<EditTransactionBase>, 10> children(mChildren);
-  for (OwningNonNull<EditTransactionBase>& childTransaction :
+  const CopyableAutoTArray<OwningNonNull<EditTransactionBase>, 10> children(
+      mChildren);
+  for (const OwningNonNull<EditTransactionBase>& childTransaction :
        Reversed(children)) {
     nsresult rv = MOZ_KnownLive(childTransaction)->UndoTransaction();
     if (NS_FAILED(rv)) {
@@ -50,8 +51,9 @@ NS_IMETHODIMP EditAggregateTransaction::UndoTransaction() {
 
 NS_IMETHODIMP EditAggregateTransaction::RedoTransaction() {
   // It's legal (but not very useful) to have an empty child list.
-  AutoTArray<OwningNonNull<EditTransactionBase>, 10> children(mChildren);
-  for (OwningNonNull<EditTransactionBase>& childTransaction : children) {
+  const CopyableAutoTArray<OwningNonNull<EditTransactionBase>, 10> children(
+      mChildren);
+  for (const OwningNonNull<EditTransactionBase>& childTransaction : children) {
     nsresult rv = MOZ_KnownLive(childTransaction)->RedoTransaction();
     if (NS_FAILED(rv)) {
       NS_WARNING("EditTransactionBase::RedoTransaction() failed");
diff --git a/editor/libeditor/EditorBase.cpp b/editor/libeditor/EditorBase.cpp
index df40d2fad7c8..0577f7da814d 100644
--- a/editor/libeditor/EditorBase.cpp
+++ b/editor/libeditor/EditorBase.cpp
@@ -1490,8 +1490,7 @@ already_AddRefed<Element> EditorBase::CreateNodeWithTransaction(
   }
 
   if (!mActionListeners.IsEmpty()) {
-    AutoActionListenerArray listeners(mActionListeners);
-    for (auto& listener : listeners) {
+    for (auto& listener : mActionListeners.Clone()) {
       DebugOnly<nsresult> rvIgnored = listener->DidCreateNode(
           nsDependentAtomString(&aTagName), newElement, rv);
       NS_WARNING_ASSERTION(
@@ -1564,8 +1563,7 @@ nsresult EditorBase::InsertNodeWithTransaction(
   }
 
   if (!mActionListeners.IsEmpty()) {
-    AutoActionListenerArray listeners(mActionListeners);
-    for (auto& listener : listeners) {
+    for (auto& listener : mActionListeners.Clone()) {
       DebugOnly<nsresult> rvIgnored =
           listener->DidInsertNode(&aContentToInsert, rv);
       NS_WARNING_ASSERTION(
@@ -1666,8 +1664,7 @@ nsresult EditorBase::DeleteNodeWithTransaction(nsIContent& aContent) {
   }
 
   if (!mActionListeners.IsEmpty()) {
-    AutoActionListenerArray listeners(mActionListeners);
-    for (auto& listener : listeners) {
+    for (auto& listener : mActionListeners.Clone()) {
       DebugOnly<nsresult> rvIgnored = listener->DidDeleteNode(&aContent, rv);
       NS_WARNING_ASSERTION(
           NS_SUCCEEDED(rvIgnored),
@@ -1753,7 +1750,7 @@ void EditorBase::NotifyEditorObservers(
 
       if (!mEditorObservers.IsEmpty()) {
         // Copy the observers since EditAction()s can modify mEditorObservers.
-        AutoEditorObserverArray observers(mEditorObservers);
+        AutoEditorObserverArray observers(mEditorObservers.Clone());
         for (auto& observer : observers) {
           DebugOnly<nsresult> rvIgnored = observer->EditAction();
           NS_WARNING_ASSERTION(
@@ -2544,8 +2541,7 @@ nsresult EditorBase::InsertTextIntoTextNodeWithTransaction(
 
   // let listeners know what happened
   if (!mActionListeners.IsEmpty()) {
-    AutoActionListenerArray listeners(mActionListeners);
-    for (auto& listener : listeners) {
+    for (auto& listener : mActionListeners.Clone()) {
       // TODO: might need adaptation because of mutation event listeners called
       // during `DoTransactionInternal`.
       DebugOnly<nsresult> rvIgnored =
@@ -2612,7 +2608,8 @@ nsresult EditorBase::NotifyDocumentListeners(
       }
       // Needs to store all listeners before notifying ComposerCommandsUpdate
       // since notifying it might change mDocStateListeners.
-      const AutoDocumentStateListenerArray listeners(mDocStateListeners);
+      const AutoDocumentStateListenerArray listeners(
+          mDocStateListeners.Clone());
       if (composerCommandsUpdate) {
         composerCommandsUpdate->OnBeforeHTMLEditorDestroyed();
       }
@@ -2653,7 +2650,8 @@ nsresult EditorBase::NotifyDocumentListeners(
       }
       // Needs to store all listeners before notifying ComposerCommandsUpdate
       // since notifying it might change mDocStateListeners.
-      const AutoDocumentStateListenerArray listeners(mDocStateListeners);
+      const AutoDocumentStateListenerArray listeners(
+          mDocStateListeners.Clone());
       if (composerCommandsUpdate) {
         composerCommandsUpdate->OnHTMLEditorDirtyStateChanged(mDocDirtyState);
       }
@@ -2690,8 +2688,7 @@ nsresult EditorBase::SetTextNodeWithoutTransaction(const nsAString& aString,
 
   // Let listeners know what's up
   if (!mActionListeners.IsEmpty() && length) {
-    AutoActionListenerArray listeners(mActionListeners);
-    for (auto& listener : listeners) {
+    for (auto& listener : mActionListeners.Clone()) {
       DebugOnly<nsresult> rvIgnored =
           listener->WillDeleteText(&aTextNode, 0, length);
       if (NS_WARN_IF(Destroyed())) {
@@ -2727,8 +2724,7 @@ nsresult EditorBase::SetTextNodeWithoutTransaction(const nsAString& aString,
 
   // Let listeners know what happened
   if (!mActionListeners.IsEmpty()) {
-    AutoActionListenerArray listeners(mActionListeners);
-    for (auto& listener : listeners) {
+    for (auto& listener : mActionListeners.Clone()) {
       if (length) {
         DebugOnly<nsresult> rvIgnored =
             listener->DidDeleteText(&aTextNode, 0, length, NS_OK);
@@ -2779,8 +2775,7 @@ nsresult EditorBase::DeleteTextWithTransaction(Text& aTextNode,
 
   // Let listeners know what's up
   if (!mActionListeners.IsEmpty()) {
-    AutoActionListenerArray listeners(mActionListeners);
-    for (auto& listener : listeners) {
+    for (auto& listener : mActionListeners.Clone()) {
       DebugOnly<nsresult> rvIgnored =
           listener->WillDeleteText(&aTextNode, aOffset, aLength);
       NS_WARNING_ASSERTION(
@@ -2800,8 +2795,7 @@ nsresult EditorBase::DeleteTextWithTransaction(Text& aTextNode,
 
   // Let listeners know what happened
   if (!mActionListeners.IsEmpty()) {
-    AutoActionListenerArray listeners(mActionListeners);
-    for (auto& listener : listeners) {
+    for (auto& listener : mActionListeners.Clone()) {
       DebugOnly<nsresult> rvIgnored =
           listener->DidDeleteText(&aTextNode, aOffset, aLength, rv);
       NS_WARNING_ASSERTION(
@@ -4133,7 +4127,7 @@ nsresult EditorBase::DeleteSelectionWithTransaction(
   // Notify nsIEditActionListener::WillDelete[Selection|Text]
   if (!mActionListeners.IsEmpty()) {
     if (!deleteContent) {
-      AutoActionListenerArray listeners(mActionListeners);
+      AutoActionListenerArray listeners(mActionListeners.Clone());
       for (auto& listener : listeners) {
         DebugOnly<nsresult> rvIgnored =
             listener->WillDeleteSelection(SelectionRefPtr());
@@ -4145,7 +4139,7 @@ nsresult EditorBase::DeleteSelectionWithTransaction(
                               "must not destroy the editor");
       }
     } else if (deleteCharData) {
-      AutoActionListenerArray listeners(mActionListeners);
+      AutoActionListenerArray listeners(mActionListeners.Clone());
       for (auto& listener : listeners) {
         // XXX Why don't we notify listeners of actual length?
         DebugOnly<nsresult> rvIgnored =
@@ -4184,7 +4178,7 @@ nsresult EditorBase::DeleteSelectionWithTransaction(
   }
 
   // Notify nsIEditActionListener::DidDelete[Selection|Text|Node]
-  AutoActionListenerArray listeners(mActionListeners);
+  AutoActionListenerArray listeners(mActionListeners.Clone());
   if (!deleteContent) {
     for (auto& listener : mActionListeners) {
       DebugOnly<nsresult> rvIgnored =
diff --git a/editor/libeditor/HTMLEditor.cpp b/editor/libeditor/HTMLEditor.cpp
index 252993859b59..6f17a7923fe3 100644
--- a/editor/libeditor/HTMLEditor.cpp
+++ b/editor/libeditor/HTMLEditor.cpp
@@ -4084,8 +4084,7 @@ already_AddRefed<nsIContent> HTMLEditor::SplitNodeWithTransaction(
   }
 
   if (!mActionListeners.IsEmpty()) {
-    AutoActionListenerArray listeners(mActionListeners);
-    for (auto& listener : listeners) {
+    for (auto& listener : mActionListeners.Clone()) {
       DebugOnly<nsresult> rvIgnored = listener->DidSplitNode(
           aStartOfRightNode.GetContainer(), newLeftContent);
       NS_WARNING_ASSERTION(
@@ -4458,8 +4457,7 @@ nsresult HTMLEditor::JoinNodesWithTransaction(nsINode& aLeftNode,
   }
 
   if (!mActionListeners.IsEmpty()) {
-    AutoActionListenerArray listeners(mActionListeners);
-    for (auto& listener : listeners) {
+    for (auto& listener : mActionListeners.Clone()) {
       DebugOnly<nsresult> rvIgnored =
           listener->DidJoinNodes(&aLeftNode, &aRightNode, parent, rv);
       NS_WARNING_ASSERTION(
diff --git a/editor/libeditor/SelectionState.cpp b/editor/libeditor/SelectionState.cpp
index 82d265dc2723..04c19bf46d9f 100644
--- a/editor/libeditor/SelectionState.cpp
+++ b/editor/libeditor/SelectionState.cpp
@@ -77,8 +77,8 @@ nsresult SelectionState::RestoreSelection(Selection& aSelection) {
   aSelection.SetDirection(mDirection);
 
   ErrorResult error;
-  AutoTArray<RefPtr<RangeItem>, 10> rangeItems(mArray);
-  for (RefPtr<RangeItem>& rangeItem : rangeItems) {
+  const CopyableAutoTArray<RefPtr<RangeItem>, 10> rangeItems(mArray);
+  for (const RefPtr<RangeItem>& rangeItem : rangeItems) {
     RefPtr<nsRange> range = rangeItem->GetRange();
     if (!range) {
       NS_WARNING("RangeItem::GetRange() failed");
diff --git a/editor/libeditor/SelectionState.h b/editor/libeditor/SelectionState.h
index 4dd56ad47bc8..0efe0b0ccff8 100644
--- a/editor/libeditor/SelectionState.h
+++ b/editor/libeditor/SelectionState.h
@@ -98,7 +98,7 @@ class SelectionState final {
   bool IsEmpty() const;
 
  private:
-  AutoTArray<RefPtr<RangeItem>, 1> mArray;
+  CopyableAutoTArray<RefPtr<RangeItem>, 1> mArray;
   nsDirection mDirection;
 
   friend class RangeUpdater;