diff --git a/webextensions/common/Tab.js b/webextensions/common/Tab.js
index 129758acc..8f86c3a15 100644
--- a/webextensions/common/Tab.js
+++ b/webextensions/common/Tab.js
@@ -212,7 +212,7 @@ export default class Tab {
         if (state == Constants.kTAB_STATE_HIGHLIGHTED)
           this.element.removeAttribute('aria-selected');
       }
-      for (const key of Object.keys(this.attributes)) {
+      for (const name of Object.keys(this.attributes)) {
         this.element.removeAttribute(name);
       }
       this.element.$TST = null;