--- a/browser/base/content/browser.css
+++ b/browser/base/content/browser.css
@@ -818,17 +818,16 @@ html|*#fullscreen-exit-button {
 
 #invalid-form-popup > description {
   max-width: 280px;
 }
 
 .popup-anchor {
   /* should occupy space but not be visible */
   opacity: 0;
-  visibility: hidden;
   pointer-events: none;
   -moz-stack-sizing: ignore;
 }
 
 #addon-progress-notification {
   -moz-binding: url("chrome://browser/content/urlbarBindings.xml#addon-progress-notification");
 }