diff --git a/content_script.js b/content_script.js
index cc3c401..237479c 100644
--- a/content_script.js
+++ b/content_script.js
@@ -48,4 +48,16 @@ function handleText(textNode)
 	textNode.nodeValue = v;
 }
 
+MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
 
+var observer = new MutationObserver(function(mutations, observer) {
+    loadReplace();
+});
+
+// define what element should be observed by the observer
+// and what types of mutations trigger the callback
+observer.observe(document, {
+  subtree: true,
+  childList: true
+  //...
+});
\ No newline at end of file