diff --git a/editor/libeditor/nsEditor.cpp b/editor/libeditor/nsEditor.cpp
index 90bd22057..4656d1496 100644
--- a/editor/libeditor/nsEditor.cpp
+++ b/editor/libeditor/nsEditor.cpp
@@ -146,6 +146,7 @@ nsEditor::nsEditor()
 ,  mDispatchInputEvent(true)
 ,  mIsInEditAction(false)
 ,  mHidingCaret(false)
+,  mSpellCheckerDictionaryUpdated(true)
 {
 }
 
@@ -1309,6 +1310,11 @@ NS_IMETHODIMP nsEditor::SyncRealTimeSpell()
   GetInlineSpellChecker(enable, getter_AddRefs(spellChecker));
 
   if (mInlineSpellChecker) {
+    if (!mSpellCheckerDictionaryUpdated && enable) {
+      mInlineSpellChecker->UpdateCurrentDictionary();
+      mSpellCheckerDictionaryUpdated = true;
+    }
+
     // We might have a mInlineSpellChecker even if there are no dictionaries
     // available since we don't destroy the mInlineSpellChecker when the last
     // dictionariy is removed, but in that case spellChecker is null
@@ -5122,8 +5128,10 @@ void
 nsEditor::OnFocus(nsIDOMEventTarget* aFocusEventTarget)
 {
   InitializeSelection(aFocusEventTarget);
-  if (mInlineSpellChecker) {
+  mSpellCheckerDictionaryUpdated = false;
+  if (mInlineSpellChecker && CanEnableSpellCheck()) {
     mInlineSpellChecker->UpdateCurrentDictionary();
+    mSpellCheckerDictionaryUpdated = true;
   }
 }
 
diff --git a/editor/libeditor/nsEditor.h b/editor/libeditor/nsEditor.h
index 725898ece..feb3ed21a 100644
--- a/editor/libeditor/nsEditor.h
+++ b/editor/libeditor/nsEditor.h
@@ -883,6 +883,7 @@ protected:
   bool mDispatchInputEvent;
   bool mIsInEditAction;   // true while the instance is handling an edit action
   bool mHidingCaret;      // whether caret is hidden forcibly.
+  bool mSpellCheckerDictionaryUpdated;  // Whether spellchecker dictionary is initialized after focused.
 
   friend bool NSCanUnload(nsISupports* serviceMgr);
   friend class nsAutoTxnsConserveSelection;