diff --git a/src/content/content.js b/src/content/content.js
index 9c4da57..384ca10 100644
--- a/src/content/content.js
+++ b/src/content/content.js
@@ -14,7 +14,8 @@
   function safeHTML(el, html) {
     const template = document.createElement('template');
     template.innerHTML = html;
-    el.replaceChildren(...template.content.childNodes);
+    // Convert to static array — childNodes is live and shrinks as nodes move
+    el.replaceChildren(...Array.from(template.content.childNodes));
   }
 
   // ============================================================
diff --git a/src/options/options.js b/src/options/options.js
index 5f6eaa6..fbf0b11 100644
--- a/src/options/options.js
+++ b/src/options/options.js
@@ -17,7 +17,7 @@ const $ = (sel) => document.querySelector(sel);
 // --- Safe innerHTML replacement (AMO-compliant) ---
 function safeHTML(el, html) {
   const doc = new DOMParser().parseFromString(html, 'text/html');
-  el.replaceChildren(...doc.body.childNodes);
+  el.replaceChildren(...Array.from(doc.body.childNodes));
 }
 
 document.addEventListener('DOMContentLoaded', async () => {
diff --git a/src/popup/popup.js b/src/popup/popup.js
index 76de432..9b0ee0d 100644
--- a/src/popup/popup.js
+++ b/src/popup/popup.js
@@ -21,7 +21,7 @@ const $$ = (sel) => document.querySelectorAll(sel);
 // --- Safe innerHTML replacement (AMO-compliant) ---
 function safeHTML(el, html) {
   const doc = new DOMParser().parseFromString(html, 'text/html');
-  el.replaceChildren(...doc.body.childNodes);
+  el.replaceChildren(...Array.from(doc.body.childNodes));
 }
 
 // --- Init ---