Implement the actual tab rearrangement on setup

module/tweaks/rearrangeSidebarTabs.mjs

@@ -32,8 +32,32 @@ export function rearrangeSidebarTabs() {
 	// #endregion Registration
 
 	// #region Implementation
-	// TODO: do this
+	updateTabOrder();
 	// #endregion Implementation
 
 	status[key] = SettingStatusEnum.Registered;
 };
+
+function updateTabOrder() {
+	const order = game.settings.get(__ID__, `${key}User`)
+		?? game.settings.get(__ID__, `${key}World`)
+		?? null;
+	if (!order) { return };
+
+	const tabs = CONFIG.ui.sidebar.TABS;
+	const replaced = {};
+
+	// Sort all of the tabs that are provided
+	for (const tabID of order) {
+		if (!tabs[tabID]) { continue };
+		replaced[tabID] = tabs[tabID];
+	};
+
+	// Add any tabs that are not in the ordering yet
+	for (const tabID in tabs) {
+		if (replaced[tabID] != null) { continue };
+		replaced[tabID] = tabs[tabID];
+	};
+
+	CONFIG.ui.sidebar.TABS = replaced;
+};