diff -r 000000000000 -r 6474c204b198 browser/themes/shared/devtools/splitview.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/themes/shared/devtools/splitview.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,156 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* 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/. */
+
+%filter substitution
+%define smw_marginDark #000
+%define smw_marginLight #aaa
+%define smw_itemDarkTopBorder rgba(0,0,0,0.2)
+%define smw_itemDarkBottomBorder rgba(128,128,128,0.15)
+%define smw_itemLightTopBorder rgba(128,128,128,0.15)
+%define smw_itemLightBottomBorder transparent
+
+.loading .splitview-nav-container {
+  background-image: url(chrome://global/skin/icons/loading_16.png);
+  background-repeat: no-repeat;
+  background-position: center center;
+}
+
+.theme-dark .splitview-nav-container {
+  background: url(background-noise-toolbar.png), #343c45;
+}
+
+.splitview-nav {
+  -moz-appearance: none;
+  list-style-image: none;
+  list-style: none;
+  padding: 0;
+  margin: 0;
+}
+
+.theme-dark .splitview-nav {
+  box-shadow: inset -1px 0 0 @smw_marginDark@;
+}
+
+.theme-dark .splitview-nav:-moz-locale-dir(rtl) {
+  box-shadow: inset 1px 0 0 @smw_marginDark@;
+}
+
+.theme-light .splitview-nav {
+  box-shadow: inset -1px 0 0 @smw_marginLight@;
+}
+
+.theme-light .splitview-nav:-moz-locale-dir(rtl) {
+  box-shadow: inset 1px 0 0 @smw_marginLight@;
+}
+
+.splitview-nav > li {
+  /* To compensate for the top and bottom borders */
+  margin-top: -1px;
+  margin-bottom: -1px;
+  -moz-padding-end: 8px;
+  -moz-box-align: center;
+  outline: 0;
+  vertical-align: bottom;
+}
+
+.theme-dark .splitview-nav > li {
+  border-top: 1px solid @smw_itemDarkTopBorder@;
+  border-bottom: 1px solid @smw_itemDarkBottomBorder@;
+}
+
+.theme-dark .splitview-nav > li:last-of-type {
+  box-shadow: inset 0 -1px 0 @smw_itemDarkTopBorder@;
+}
+
+.theme-light  .splitview-nav > li {
+  border-top: 1px solid @smw_itemLightTopBorder@;
+  border-bottom: 1px solid @smw_itemLightBottomBorder@;
+}
+
+.theme-light .splitview-nav > li:last-of-type {
+  box-shadow: inset 0 -1px 0 @smw_itemLightTopBorder@;
+}
+
+.placeholder {
+  -moz-box-flex: 1;
+  text-align: center;
+}
+
+.splitview-nav > li.splitview-active {
+  background-repeat: no-repeat, no-repeat, repeat-x;
+  background-position: center right, center right, top left;
+  background-size: auto, 1px, auto;
+}
+
+.splitview-nav > li.splitview-active:-moz-locale-dir(rtl) {
+  background-repeat: no-repeat, no-repeat, repeat-x;
+  background-position: center left, center left, top right;
+}
+
+.theme-dark .splitview-nav > li.splitview-active {
+  background-image: url(itemArrow-dark-ltr.png),
+                    linear-gradient(@smw_marginDark@, @smw_marginDark@),
+                    linear-gradient(#1d4f73, #1d4f73);
+}
+
+.theme-dark .splitview-nav > li.splitview-active:-moz-locale-dir(rtl) {
+  background-image: url(itemArrow-dark-rtl.png),
+                    linear-gradient(@smw_marginDark@, @smw_marginDark@),
+                    linear-gradient(#1d4f73, #1d4f73);
+}
+
+.theme-light .splitview-nav > li.splitview-active {
+  background-image: url(itemArrow-ltr.svg),
+                    linear-gradient(@smw_marginLight@, @smw_marginLight@),
+                    linear-gradient(#4c9ed9, #4c9ed9);
+}
+
+.theme-light .splitview-nav > li.splitview-active:-moz-locale-dir(rtl) {
+  background-image: url(itemArrow-rtl.svg),
+                    linear-gradient(@smw_marginLight@, @smw_marginLight@),
+                    linear-gradient(#4c9ed9, #4c9ed9);
+}
+
+/* Toolbars */
+
+.splitview-main > .devtools-toolbar {
+  background-origin: border-box;
+  background-clip: border-box;
+}
+
+.theme-dark .splitview-main > toolbar,
+.theme-dark .loading .splitview-nav-container {
+  -moz-border-end: 1px solid @smw_marginDark@;
+}
+
+.theme-light .splitview-main > toolbar,
+.theme-light .loading .splitview-nav-container {
+  -moz-border-end: 1px solid @smw_marginLight@;
+}
+
+.splitview-main > .devtools-toolbarbutton {
+  font-size: 11px;
+  padding: 0 8px;
+  width: auto;
+  min-width: 48px;
+  min-height: 0;
+}
+
+
+/* Resizers */
+
+.splitview-portrait-resizer {
+  -moz-appearance: none;
+  background: linear-gradient(black 1px, rgba(255,255,255,0.2) 1px),
+              linear-gradient(hsl(210,11%,36%), hsl(210,11%,18%));
+  height: 12px;
+  background-size: 10px 2px, 100% 12px;
+  background-clip: content-box, border-box;
+  background-repeat: repeat-y, no-repeat;
+  background-position: center center;
+  padding: 2px 0;
+  border-top: 1px solid hsla(210,8%,5%,.5);
+  border-bottom: 1px solid hsla(210,8%,5%,.5);
+}