diff -r 000000000000 -r 6474c204b198 toolkit/components/prompts/content/tabprompts.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/prompts/content/tabprompts.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,34 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Tab Modal Prompt boxes */
+tabmodalprompt {
+  width: 100%;
+  height: 100%;
+  -moz-box-pack: center;
+  -moz-box-orient: vertical;
+}
+
+.mainContainer {
+  min-width: 20em;
+  min-height: 12em;
+}
+
+.info\.title {
+  margin-bottom: 1em !important;
+  font-weight: bold;
+}
+
+.info\.body {
+  margin: 0 !important;
+  -moz-user-focus: normal;
+  -moz-user-select: text;
+  cursor: text !important;
+  white-space: pre-wrap;
+  unicode-bidi: -moz-plaintext;
+}
+
+label[value=""] {
+  visibility: collapse;
+}