diff -r 000000000000 -r 6474c204b198 browser/base/content/highlighter.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/highlighter.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,72 @@
+/* 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/. */
+
+.highlighter-container {
+  pointer-events: none;
+}
+
+/*
+ * Box model highlighter
+ */
+svg|svg.box-model-root[hidden],
+svg|line.box-model-guide-top[hidden],
+svg|line.box-model-guide-right[hidden],
+svg|line.box-model-guide-left[hidden],
+svg|line.box-model-guide-bottom[hidden] {
+  display: none;
+}
+
+/*
+ * Node Infobar
+ */
+.highlighter-nodeinfobar-container {
+  position: relative;
+}
+
+.highlighter-nodeinfobar-positioner {
+  position: absolute;
+  max-width: 95%;
+}
+
+.highlighter-nodeinfobar-positioner[hidden] {
+  opacity: 0;
+  pointer-events: none;
+  display: -moz-box;
+}
+
+.highlighter-nodeinfobar-text {
+  overflow: hidden;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+  direction: ltr;
+}
+
+html|*.highlighter-nodeinfobar-id,
+html|*.highlighter-nodeinfobar-classes,
+html|*.highlighter-nodeinfobar-pseudo-classes,
+html|*.highlighter-nodeinfobar-tagname {
+  -moz-user-select: text;
+  -moz-user-focus: normal;
+  cursor: text;
+}
+
+.highlighter-nodeinfobar-arrow {
+  display: none;
+}
+
+.highlighter-nodeinfobar-positioner[position="top"]:not([hide-arrow]) > .highlighter-nodeinfobar-arrow-bottom {
+  display: block;
+}
+
+.highlighter-nodeinfobar-positioner[position="bottom"]:not([hide-arrow]) > .highlighter-nodeinfobar-arrow-top {
+  display: block;
+}
+
+.highlighter-nodeinfobar-positioner[disabled] {
+  visibility: hidden;
+}
+
+html|*.highlighter-nodeinfobar-tagname {
+  text-transform: lowercase;
+}