diff --git a/browser/base/content/browser-social.js b/browser/base/content/browser-social.js
index 327ebb1c5986..dd00017aee09 100644
--- a/browser/base/content/browser-social.js
+++ b/browser/base/content/browser-social.js
@@ -1359,7 +1359,8 @@ SocialMarks = {
     let providers = this.getProviders();
 
     // remove all previous entries by class
-    for (let m of document.getElementsByClassName("context-socialmarks")) {
+    let menus = [...document.getElementsByClassName("context-socialmarks")];
+    for (let m of menus) {
       m.parentNode.removeChild(m);
     }