diff --git a/editor/libeditor/HTMLEditRules.cpp b/editor/libeditor/HTMLEditRules.cpp
index 79b81ceaba76..2db7a37d6ea6 100644
--- a/editor/libeditor/HTMLEditRules.cpp
+++ b/editor/libeditor/HTMLEditRules.cpp
@@ -1626,10 +1626,10 @@ nsresult HTMLEditor::WillInsertText(EditSubAction aEditSubAction, bool* aCancel,
   return rv;
 }
 
-bool HTMLEditRules::CanContainParagraph(Element& aElement) const {
-  MOZ_ASSERT(IsEditorDataAvailable());
+bool HTMLEditor::CanContainParagraph(Element& aElement) const {
+  MOZ_ASSERT(IsEditActionDataAvailable());
 
-  if (HTMLEditorRef().CanContainTag(aElement, *nsGkAtoms::p)) {
+  if (CanContainTag(aElement, *nsGkAtoms::p)) {
     return true;
   }
 
@@ -1731,8 +1731,8 @@ EditActionResult HTMLEditRules::WillInsertParagraphSeparator() {
   // is <br> or the editing host cannot contain a <p> element, we should
   // insert a <br> element.
   else if (host == blockParent) {
-    insertBRElement =
-        separator == ParagraphSeparator::br || !CanContainParagraph(*host);
+    insertBRElement = separator == ParagraphSeparator::br ||
+                      !HTMLEditorRef().CanContainParagraph(*host);
   }
   // If the nearest block parent is a single-line container declared in
   // the execCommand spec and not the editing host, we should separate the
@@ -1746,7 +1746,7 @@ EditActionResult HTMLEditRules::WillInsertParagraphSeparator() {
     insertBRElement = true;
     for (Element* blockAncestor = blockParent; blockAncestor && insertBRElement;
          blockAncestor = HTMLEditor::GetBlockNodeParent(blockAncestor, host)) {
-      insertBRElement = !CanContainParagraph(*blockAncestor);
+      insertBRElement = !HTMLEditorRef().CanContainParagraph(*blockAncestor);
     }
   }
 
diff --git a/editor/libeditor/HTMLEditRules.h b/editor/libeditor/HTMLEditRules.h
index 3c3f9515358d..3dd745d84599 100644
--- a/editor/libeditor/HTMLEditRules.h
+++ b/editor/libeditor/HTMLEditRules.h
@@ -176,12 +176,6 @@ class HTMLEditRules : public TextEditRules {
    */
   MOZ_CAN_RUN_SCRIPT MOZ_MUST_USE nsresult InsertBRIfNeeded();
 
-  /**
-   * CanContainParagraph() returns true if aElement can have a <p> element as
-   * its child or its descendant.
-   */
-  bool CanContainParagraph(Element& aElement) const;
-
   /**
    * Insert normal <br> element into aNode when aNode is a block and it has
    * no children.
diff --git a/editor/libeditor/HTMLEditor.h b/editor/libeditor/HTMLEditor.h
index 7a308c25c18e..197040d50e6e 100644
--- a/editor/libeditor/HTMLEditor.h
+++ b/editor/libeditor/HTMLEditor.h
@@ -1187,6 +1187,12 @@ class HTMLEditor final : public TextEditor,
   MOZ_CAN_RUN_SCRIPT MOZ_MUST_USE EditActionResult
   SplitMailCiteElements(const EditorDOMPoint& aPointToSplit);
 
+  /**
+   * CanContainParagraph() returns true if aElement can have a <p> element as
+   * its child or its descendant.
+   */
+  bool CanContainParagraph(Element& aElement) const;
+
  protected:  // Called by helper classes.
   virtual void OnStartToHandleTopLevelEditSubAction(
       EditSubAction aEditSubAction, nsIEditor::EDirection aDirection) override;