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diff --git a/toolkit/content/minimal-xul.css b/toolkit/content/minimal-xul.css
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+/* 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/. */
+
+/**
+ * This file should only contain a minimal set of rules for the XUL elements
+ * that may be implicitly created as part of HTML/SVG documents (e.g.
+ * scrollbars).  Rules for everything else related to XUL can be found in
+ * xul.css.  (This split of the XUL rules is to minimize memory use and improve
+ * performance in HTML/SVG documents.)
+ *
+ * This file should also not contain any app specific styling.  Defaults for
+ * widgets of a particular application should be in that application's style
+ * sheet.  For example style definitions for navigator can be found in
+ * navigator.css.
+ *
+ * THIS FILE IS LOCKED DOWN.  YOU ARE NOT ALLOWED TO MODIFY IT WITHOUT FIRST
+ * HAVING YOUR CHANGES REVIEWED BY enndeakin@gmail.com
+ */
+
+@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */
+@namespace html url("http://www.w3.org/1999/xhtml"); /* namespace for HTML elements */
+
+* {
+  -moz-user-focus: ignore;
+  -moz-user-select: none;
+  display: -moz-box;
+  box-sizing: border-box;
+}
+
+:root {
+  text-rendering: optimizeLegibility;
+  -moz-binding: url("chrome://global/content/bindings/general.xml#root-element");
+  -moz-control-character-visibility: visible;
+}
+
+:root:-moz-locale-dir(rtl) {
+  direction: rtl;
+}
+
+/* hide the content and destroy the frame */
+[hidden="true"] {
+  display: none;
+}
+
+/* hide the content, but don't destroy the frames */
+[collapsed="true"],
+[moz-collapsed="true"] {
+  visibility: collapse;
+}
+
+/********** label **********/
+
+description {
+  -moz-binding: url("chrome://global/content/bindings/text.xml#text-base");
+}
+
+label {
+  -moz-binding: url("chrome://global/content/bindings/text.xml#text-label");
+}
+
+label.text-link, label[onclick] {
+  -moz-binding: url("chrome://global/content/bindings/text.xml#text-link");
+  -moz-user-focus: normal;
+}
+
+label[control], label.radio-label, label.checkbox-label, label.toolbarbutton-multiline-text {
+  -moz-binding: url("chrome://global/content/bindings/text.xml#label-control");
+}
+
+html|span.accesskey {
+  text-decoration: underline;
+}
+
+/********** resizer **********/
+
+resizer {
+  -moz-binding: url("chrome://global/content/bindings/resizer.xml#resizer");
+  position: relative;
+  z-index: 2147483647;
+}
+
+/********** scrollbar **********/
+
+/* Scrollbars are never flipped even if BiDI kicks in. */
+scrollbar[orient="horizontal"] {
+  direction: ltr;
+}
+
+thumb {
+  -moz-binding: url(chrome://global/content/bindings/scrollbar.xml#thumb);
+  display: -moz-box !important;
+}
+
+.scale-thumb {
+  -moz-binding: url(chrome://global/content/bindings/scale.xml#scalethumb);
+}
+
+scrollbar, scrollbarbutton, scrollcorner, slider, thumb, scale {
+  -moz-user-select: none;
+}
+
+scrollcorner {
+  display: -moz-box !important;
+}
+
+scrollcorner[hidden="true"] {
+  display: none !important;
+}
+
+scrollbar[value="hidden"] {
+  visibility: hidden;
+}
+
+scale {
+  -moz-binding: url(chrome://global/content/bindings/scale.xml#scale);
+}
+
+.scale-slider {
+  -moz-binding: url(chrome://global/content/bindings/scale.xml#scaleslider);
+  -moz-user-focus: normal;
+}
+
+scrollbarbutton[sbattr="scrollbar-up-top"]:not(:-moz-system-metric(scrollbar-start-backward)),
+scrollbarbutton[sbattr="scrollbar-down-top"]:not(:-moz-system-metric(scrollbar-start-forward)),
+scrollbarbutton[sbattr="scrollbar-up-bottom"]:not(:-moz-system-metric(scrollbar-end-backward)),
+scrollbarbutton[sbattr="scrollbar-down-bottom"]:not(:-moz-system-metric(scrollbar-end-forward)) {
+  display: none;
+}
+
+thumb[sbattr="scrollbar-thumb"]:-moz-system-metric(scrollbar-thumb-proportional) {
+  -moz-box-flex: 1;
+}