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diff --git a/comm/mail/themes/ThemeVariableMap.sys.mjs b/comm/mail/themes/ThemeVariableMap.sys.mjs
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+++ b/comm/mail/themes/ThemeVariableMap.sys.mjs
@@ -0,0 +1,194 @@
+/* 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/. */
+
+export const ThemeVariableMap = [
+  [
+    "--lwt-accent-color-inactive",
+    {
+      lwtProperty: "accentcolorInactive",
+    },
+  ],
+  [
+    "--lwt-background-alignment",
+    {
+      isColor: false,
+      lwtProperty: "backgroundsAlignment",
+    },
+  ],
+  [
+    "--lwt-background-tiling",
+    {
+      isColor: false,
+      lwtProperty: "backgroundsTiling",
+    },
+  ],
+  [
+    "--tab-loading-fill",
+    {
+      lwtProperty: "tab_loading",
+    },
+  ],
+  [
+    "--lwt-tab-text",
+    {
+      lwtProperty: "tab_text",
+    },
+  ],
+  [
+    "--lwt-tab-line-color",
+    {
+      lwtProperty: "tab_line",
+    },
+  ],
+  [
+    "--lwt-background-tab-separator-color",
+    {
+      lwtProperty: "tab_background_separator",
+    },
+  ],
+  [
+    "--toolbar-bgcolor",
+    {
+      lwtProperty: "toolbarColor",
+    },
+  ],
+  [
+    "--toolbar-color",
+    {
+      lwtProperty: "toolbar_text",
+    },
+  ],
+  [
+    "--lwt-tabs-border-color",
+    {
+      lwtProperty: "toolbar_top_separator",
+    },
+  ],
+  [
+    "--toolbarseparator-color",
+    {
+      lwtProperty: "toolbar_vertical_separator",
+    },
+  ],
+  [
+    "--chrome-content-separator-color",
+    {
+      lwtProperty: "toolbar_bottom_separator",
+    },
+  ],
+  [
+    "--toolbarbutton-icon-fill",
+    {
+      lwtProperty: "icon_color",
+    },
+  ],
+  [
+    "--lwt-toolbarbutton-icon-fill-attention",
+    {
+      lwtProperty: "icon_attention_color",
+    },
+  ],
+  [
+    "--lwt-toolbarbutton-hover-background",
+    {
+      lwtProperty: "button_background_hover",
+    },
+  ],
+  [
+    "--lwt-toolbarbutton-active-background",
+    {
+      lwtProperty: "button_background_active",
+    },
+  ],
+  [
+    "--lwt-selected-tab-background-color",
+    {
+      lwtProperty: "tab_selected",
+    },
+  ],
+  [
+    "--arrowpanel-border-color",
+    {
+      lwtProperty: "popup_border",
+    },
+  ],
+  [
+    "--autocomplete-popup-highlight-background",
+    {
+      lwtProperty: "popup_highlight",
+    },
+  ],
+  [
+    "--autocomplete-popup-highlight-color",
+    {
+      lwtProperty: "popup_highlight_text",
+    },
+  ],
+  [
+    "--sidebar-background-color",
+    {
+      lwtProperty: "sidebar",
+    },
+  ],
+  [
+    "--sidebar-text-color",
+    {
+      lwtProperty: "sidebar_text",
+      processColor(rgbaChannels, element) {
+        if (!rgbaChannels) {
+          element.removeAttribute("lwt-tree");
+          element.removeAttribute("lwt-tree-brighttext");
+          return null;
+        }
+
+        const { r, g, b } = rgbaChannels;
+        let luminance = 0.2125 * r + 0.7154 * g + 0.0721 * b;
+        let brighttext = luminance > 110;
+
+        element.setAttribute("lwt-tree", "true");
+        if (!brighttext) {
+          element.removeAttribute("lwt-tree-brighttext");
+        } else {
+          element.setAttribute("lwt-tree-brighttext", "true");
+        }
+
+        // Drop alpha channel.
+        return `rgb(${r}, ${g}, ${b})`;
+      },
+    },
+  ],
+  [
+    "--sidebar-highlight-background-color",
+    {
+      lwtProperty: "sidebar_highlight",
+    },
+  ],
+  [
+    "--sidebar-highlight-text-color",
+    {
+      lwtProperty: "sidebar_highlight_text",
+    },
+  ],
+  [
+    "--sidebar-border-color",
+    {
+      lwtProperty: "sidebar_border",
+    },
+  ],
+  [
+    "--sidebar-highlight-border-color",
+    {
+      lwtProperty: "sidebar_highlight_border",
+    },
+  ],
+];
+
+export const ThemeContentPropertyList = [
+  "ntp_background",
+  "ntp_text",
+  "sidebar",
+  "sidebar_highlight",
+  "sidebar_highlight_text",
+  "sidebar_text",
+];