diff --git a/content/events/src/nsEventListenerManager.cpp b/content/events/src/nsEventListenerManager.cpp
index 211aa72708cb..17b2fd2d583d 100644
--- a/content/events/src/nsEventListenerManager.cpp
+++ b/content/events/src/nsEventListenerManager.cpp
@@ -228,10 +228,11 @@ nsEventListenerManager::AddEventListenerInternal(
   uint32_t count = mListeners.Length();
   for (uint32_t i = 0; i < count; i++) {
     ls = &mListeners.ElementAt(i);
-    if (ls->mListener == aListener &&
-        ls->mListenerIsHandler == aHandler &&
+    // mListener == aListener is the last one, since it can be a bit slow.
+    if (ls->mListenerIsHandler == aHandler &&
         ls->mFlags == aFlags &&
-        EVENT_TYPE_EQUALS(ls, aType, aTypeAtom, aTypeString, aAllEvents)) {
+        EVENT_TYPE_EQUALS(ls, aType, aTypeAtom, aTypeString, aAllEvents) &&
+        ls->mListener == aListener) {
       return;
     }
   }