diff -r 000000000000 -r 6474c204b198 browser/themes/shared/devtools/markup-view.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/themes/shared/devtools/markup-view.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+/* 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/. */
+
+* {
+  padding: 0;
+  margin: 0;
+}
+
+.more-nodes {
+  padding-left: 16px;
+}
+
+.styleinspector-propertyeditor {
+  border: 1px solid #CCC;
+}
+
+
+/* Selected nodes in the tree should have light selected text.
+   theme-selected doesn't work in this case since the text is a
+   sibling of the class, not a child. */
+.theme-selected ~ .editor,
+.theme-selected ~ .editor .theme-fg-color1,
+.theme-selected ~ .editor .theme-fg-color2,
+.theme-selected ~ .editor .theme-fg-color3,
+.theme-selected ~ .editor .theme-fg-color4,
+.theme-selected ~ .editor .theme-fg-color5,
+.theme-selected ~ .editor .theme-fg-color6,
+.theme-selected ~ .editor .theme-fg-color7 {
+  color: #f5f7fa; /* Light foreground text */
+}
+
+.tag-line {
+  padding-left: 2px;
+}