--- a/browser/components/extensions/ExtensionPopups.jsm
+++ b/browser/components/extensions/ExtensionPopups.jsm
@@ -464,16 +464,17 @@ class ViewPopup extends BasePopup {
    * @returns {Promise<boolean>}
    *        Resolves when the browser is ready. Resolves to `false` if the
    *        browser was destroyed before it was fully loaded, and the popup
    *        should be closed, or `true` otherwise.
    */
   async attach(viewNode) {
     this.viewNode = viewNode;
     this.viewNode.addEventListener(this.DESTROY_EVENT, this);
+    this.viewNode.setAttribute("closemenu", "none");
 
     if (this.extension.remote) {
       this.panel.setAttribute("remote", "true");
     }
 
     // Wait until the browser element is fully initialized, and give it at least
     // a short grace period to finish loading its initial content, if necessary.
     //