--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -8035,16 +8035,17 @@ var gIdentityHandler = {
     nameLabel.setAttribute("class", "identity-popup-permission-label");
     nameLabel.textContent = SitePermissions.getPermissionLabel(aPermission.id);
 
     if (aPermission.id == "popup") {
       let menulist = document.createElement("menulist");
       let menupopup = document.createElement("menupopup");
       let block = document.createElement("vbox");
       block.setAttribute("id", "identity-popup-popup-container");
+      menulist.setAttribute("sizetopopup", "none");
       menulist.setAttribute("class", "identity-popup-popup-menulist");
       menulist.setAttribute("id", "identity-popup-popup-menulist");
 
       for (let state of SitePermissions.getAvailableStates(aPermission.id)) {
         let menuitem = document.createElement("menuitem");
         if (state == SitePermissions.getDefault(aPermission.id)) {
           menuitem.setAttribute("value", 0);
         } else {

--- a/browser/themes/shared/notification-icons.inc.css
+++ b/browser/themes/shared/notification-icons.inc.css
@@ -156,17 +156,17 @@ html|*#webRTC-previewVideo {
 }
 
 .popup-subitem {
   list-style-image: url("chrome://browser/skin/notification-icons/popup-subitem.svg");
   margin-inline-start: 30px;
 }
 
 .identity-popup-popup-menulist {
-  width: 72px;
+  min-width: 6.5em;
 }
 
 /* EME */
 
 .popup-notification-icon[popupid="drmContentPlaying"],
 .drm-icon {
   list-style-image: url("chrome://browser/skin/drm-icon.svg");
 }