diff -r 000000000000 -r 6474c204b198 browser/themes/shared/devtools/highlighter.inc.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/themes/shared/devtools/highlighter.inc.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,102 @@
+%if 0
+/* 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/. */
+%endif
+
+/* Box model highlighter */
+svg|g.box-model-container {
+  opacity: 0.4;
+}
+
+svg|polygon.box-model-content {
+  fill: #80d4ff;
+}
+
+svg|polygon.box-model-padding {
+  fill: #66cc52;
+}
+
+svg|polygon.box-model-border {
+  fill: #ffe431;
+}
+
+svg|polygon.box-model-margin {
+  fill: #d89b28;
+}
+
+svg|polygon.box-model-content,
+svg|polygon.box-model-padding,
+svg|polygon.box-model-border,
+svg|polygon.box-model-margin {
+  stroke: none;
+}
+
+svg|line.box-model-guide-top,
+svg|line.box-model-guide-right,
+svg|line.box-model-guide-bottom,
+svg|line.box-model-guide-left {
+  stroke: #08C;
+  stroke-dasharray: 5 3;
+}
+
+/* Highlighter - Node Infobar */
+
+.highlighter-nodeinfobar {
+  color: hsl(216,33%,97%);
+  border-radius: 3px;
+  background: hsl(214,13%,24%) no-repeat padding-box;
+  padding: 5px;
+  /* Avoid cases where the infobar is smaller than the arrow, when the text is
+  short */
+  min-width: 75px;
+}
+
+/* Highlighter - Node Infobar - text */
+
+.highlighter-nodeinfobar-text {
+  text-align: center;
+  /* 100% - size of the buttons and margins */
+  max-width: calc(100% - 2 * (26px + 6px));
+  padding-bottom: 1px;
+}
+
+html|*.highlighter-nodeinfobar-tagname {
+  color: hsl(285,100%,75%);
+}
+
+html|*.highlighter-nodeinfobar-id {
+  color: hsl(103,46%,54%);
+}
+
+html|*.highlighter-nodeinfobar-classes,
+html|*.highlighter-nodeinfobar-pseudo-classes {
+  color: hsl(200,74%,57%);
+}
+
+/* Highlighter - Node Infobar - box & arrow */
+
+.highlighter-nodeinfobar-arrow {
+  width: 14px;
+  height: 14px;
+  -moz-margin-start: calc(50% - 7px);
+  transform: rotate(-45deg);
+  background-clip: padding-box;
+  background-repeat: no-repeat;
+}
+
+.highlighter-nodeinfobar-arrow-top {
+  margin-bottom: -8px;
+  margin-top: 8px;
+  background-image: linear-gradient(to top right, transparent 50%, hsl(210,2%,22%) 50%);
+}
+
+.highlighter-nodeinfobar-arrow-bottom {
+  margin-top: -8px;
+  margin-bottom: 8px;
+  background-image: linear-gradient(to bottom left, transparent 50%, hsl(210,2%,22%) 50%);
+}
+
+.highlighter-nodeinfobar-container[hide-arrow] > .highlighter-nodeinfobar {
+  margin: 7px 0;
+}