--- a/browser/components/customizableui/content/panelUI.js
+++ b/browser/components/customizableui/content/panelUI.js
@@ -635,16 +635,22 @@ const PanelUI = {
     }
     if (!aIsRemoval &&
         (this.panel.state == "open" ||
          document.documentElement.hasAttribute("customizing"))) {
       this._adjustLabelsForAutoHyphens(aNode);
     }
   },
 
+  onAreaReset(aArea, aContainer) {
+    if (gPhotonStructure && aContainer == this.overflowFixedList) {
+      this.updateOverflowStatus();
+    }
+  },
+
   /**
    * Signal that we're about to make a lot of changes to the contents of the
    * panels all at once. For performance, we ignore the mutations.
    */
   beginBatchUpdate() {
     this._ensureEventListenersAdded();
     this.multiView.ignoreMutations = true;
   },