1 files changed, 50 insertions, 0 deletions
diff --git a/browser/themes/shared/tab-list-tree.css b/browser/themes/shared/tab-list-tree.css
new file mode 100644
index 0000000000..ed60f26df1
--- /dev/null
+++ b/browser/themes/shared/tab-list-tree.css
@@ -0,0 +1,50 @@
+/* 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 is used by both about:sessionrestore and about:welcomeback */
+
+.tab-list-tree-container {
+  display: flex;
+  flex-direction: column;
+  flex-grow: 1;
+  justify-content: center;
+}
+
+treechildren::-moz-tree-image(icon),
+treechildren::-moz-tree-image(noicon) {
+  -moz-context-properties: fill;
+  fill: currentColor;
+  padding-inline-end: 2px;
+  margin: 0 2px;
+  width: 16px;
+  height: 16px;
+}
+
+treechildren::-moz-tree-image(noicon) {
+  list-style-image: url("chrome://global/skin/icons/defaultFavicon.svg");
+}
+
+treechildren::-moz-tree-image(container, noicon) {
+  list-style-image: url("chrome://browser/skin/window.svg");
+}
+
+treechildren::-moz-tree-image(checked),
+treechildren::-moz-tree-image(partial) {
+  -moz-context-properties: fill, stroke;
+  fill: var(--in-content-accent-color);
+}
+
+treechildren::-moz-tree-image(checked, selected),
+treechildren::-moz-tree-image(partial, selected) {
+  fill: var(--in-content-item-selected-text);
+  stroke: var(--in-content-item-selected);
+}
+
+treechildren::-moz-tree-image(checked) {
+  list-style-image: url("chrome://global/skin/icons/check.svg");
+}
+
+treechildren::-moz-tree-image(partial) {
+  list-style-image: url("chrome://global/skin/icons/check-partial.svg");
+}