Update dev-tools.js

dev-tools.js

@@ -566,7 +566,6 @@
     LCP: null,
     TTFB: null
   };
-let observer;
   // DOM変更を監視するMutationObserver
   let observer = new MutationObserver((mutations) => {
     mutations.forEach((mutation) => {
@@ -594,20 +593,6 @@ const loadWebVitals = () => {
   });
 };
 
-// DOMContentLoaded内に追加
-observer = new MutationObserver((mutations) => {
-  mutations.forEach((mutation) => {
-    if (mutation.type === 'childList') {
-      mutation.addedNodes.forEach((node) => {
-        if (node.nodeType === Node.ELEMENT_NODE) {
-          highlightNode(node);
-        }
-      });
-    }
-  });
-  refreshElementsPanel();
-});
-
 observer.observe(document.documentElement, {
   childList: true,
   subtree: true,