From cf7898eda04f937747c2bf9e4b46cb0d72c5eacf Mon Sep 17 00:00:00 2001
From: webchick <drupal@webchick.net>
Date: Wed, 11 Feb 2015 10:57:52 -0800
Subject: [PATCH] Issue #2423781 by alexpott, dawehner, cosmicdreams,
 davidhernandez, LewisNyman: Firefox crash using a modal

---
 core/themes/seven/css/components/dialog.theme.css | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/themes/seven/css/components/dialog.theme.css b/core/themes/seven/css/components/dialog.theme.css
index 4fbe56b15da..7dfd9cc3f0e 100644
--- a/core/themes/seven/css/components/dialog.theme.css
+++ b/core/themes/seven/css/components/dialog.theme.css
@@ -7,7 +7,9 @@
   border: 0;
   position: absolute;
   z-index: 1260;
-  overflow: visible;
+  /* jQuery UI modals crash in Firefox unless overflow is set to hidden.
+     See: https://www.drupal.org/node/2423781 */
+  overflow: hidden;
   padding: 0;
 }
 @media all and (max-width: 48em) { /* 768px */