diff --git a/editor/libeditor/EditorEventListener.h b/editor/libeditor/EditorEventListener.h
--- a/editor/libeditor/EditorEventListener.h
+++ b/editor/libeditor/EditorEventListener.h
@@ -108,11 +108,11 @@
   /**
    * EnsureCommitComposition() requests to commit composition if there is.
    * Returns false if the editor is detached from the listener, i.e.,
    * impossible to continue to handle the event.  Otherwise, true.
    */
-  MOZ_MUST_USE bool EnsureCommitCompoisition();
+  MOZ_MUST_USE bool EnsureCommitComposition();
 
   EditorBase* mEditorBase; // weak
   RefPtr<nsCaret> mCaret;
   bool mCommitText;
   bool mInTransaction;
diff --git a/editor/libeditor/EditorEventListener.cpp b/editor/libeditor/EditorEventListener.cpp
--- a/editor/libeditor/EditorEventListener.cpp
+++ b/editor/libeditor/EditorEventListener.cpp
@@ -354,11 +354,11 @@
   return NS_WARN_IF(!aWidgetEvent) || DetachedFromEditor() ||
          aWidgetEvent->DefaultPrevented();
 }
 
 bool
-EditorEventListener::EnsureCommitCompoisition()
+EditorEventListener::EnsureCommitComposition()
 {
   MOZ_ASSERT(!DetachedFromEditor());
   RefPtr<EditorBase> editorBase(mEditorBase);
   editorBase->CommitComposition();
   return !DetachedFromEditor();
@@ -672,11 +672,11 @@
     return NS_OK;
   }
 
   // If we got a mouse down inside the editing area, we should force the
   // IME to commit before we change the cursor position.
-  if (!EnsureCommitCompoisition()) {
+  if (!EnsureCommitComposition()) {
     return NS_OK;
   }
 
   // XXX The following code is hack for our buggy "click" and "auxclick"
   //     implementation.  "auxclick" event was added recently, however,
@@ -743,11 +743,11 @@
   // FYI: This may be called by HTMLEditorEventListener::MouseDown() even
   //      when the event is not acceptable for committing composition.
   if (DetachedFromEditor()) {
     return NS_OK;
   }
-  Unused << EnsureCommitCompoisition();
+  Unused << EnsureCommitComposition();
   return NS_OK;
 }
 
 /**
  * Drag event implementation
diff --git a/editor/libeditor/HTMLEditorEventListener.cpp b/editor/libeditor/HTMLEditorEventListener.cpp
--- a/editor/libeditor/HTMLEditorEventListener.cpp
+++ b/editor/libeditor/HTMLEditorEventListener.cpp
@@ -70,11 +70,11 @@
 
   // Even if it's not acceptable mousedown event (i.e., when mousedown
   // event is fired outside of the active editing host), we need to commit
   // composition because it will be change the selection to the clicked
   // point.  Then, we won't be able to commit the composition.
-  if (!EnsureCommitCompoisition()) {
+  if (!EnsureCommitComposition()) {
     return NS_OK;
   }
 
   WidgetMouseEvent* mousedownEvent =
     aMouseEvent->WidgetEventPtr()->AsMouseEvent();