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diff --git a/toolkit/themes/windows/global/button.css b/toolkit/themes/windows/global/button.css
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+++ b/toolkit/themes/windows/global/button.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/. */
+
+/* ===== button.css =====================================================
+  == Styles used by the XUL button element.
+  ======================================================================= */
+
+@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
+
+/* :::::::::: button :::::::::: */
+
+button {
+  margin: 1px 5px 2px;
+  min-width: 6.3em;
+  color: ButtonText;
+  text-shadow: none;
+}
+
+.button-box {
+  padding-block: 2px 3px;
+  padding-inline: 4px 5px;
+}
+
+.button-text {
+  margin: 0;
+  text-align: center;
+}
+
+/* .......... focused state .......... */
+
+button:-moz-focusring {
+  outline: 1px dotted;
+  outline-offset: -3px;
+}
+
+/* .......... default/hover/focused state .......... */
+
+@media (-moz-windows-default-theme: 0) {
+  @media (-moz-windows-compositor) {
+    /* This is for high-contrast black and white themes on Windows 8 and later,
+       where the native appearance renders a different background (which
+       appears to be equivalent to the Highlight color) if the button is in the
+       default, hovered or focused state. However, if these states overlap with
+       the active, disabled, open or checked state, the appearance reverts back
+       to the default background. */
+    button:is([default="true"],:hover,:focus):not(:active,[disabled="true"],[open="true"],[checked="true"]) {
+      color: HighlightText;
+    }
+  }
+}
+
+/* .......... disabled state .......... */
+
+button[disabled="true"] {
+  color: GrayText;
+}
+
+@media (-moz-windows-classic) {
+  button[disabled="true"] {
+    color: ThreeDShadow;
+    text-shadow: 1px 1px ThreeDHighlight;
+  }
+}
+
+/* ::::: menu buttons ::::: */
+
+.button-menu-dropmarker {
+  appearance: none;
+  list-style-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  -moz-context-properties: fill;
+  fill: currentColor;
+  width: 12px;
+  height: 12px;
+}
+
+/* ::::: plain buttons ::::: */
+
+button.plain {
+  margin: 0 !important;
+  padding: 0 !important;
+}
+
+button[type="disclosure"] {
+  margin: 0;
+  appearance: none;
+  list-style-image: url("chrome://global/skin/icons/twisty-collapsed.svg");
+  -moz-context-properties: fill;
+  fill: currentColor;
+  min-width: 0;
+}
+
+button[type="disclosure"][open="true"] {
+  list-style-image: url("chrome://global/skin/icons/twisty-expanded.svg");
+}