diff --git a/eslint.config.mjs b/eslint.config.mjs
index f4bac84ec2..921be57464 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -99,6 +99,19 @@ export default defineConfig([
 			"sort-keys": "off"
 		}
 	},
+	{
+		files: [
+			"js/main.js",
+			"js/module.js",
+			"js/loader.js",
+			"js/socketclient.js",
+			"js/translator.js"
+		],
+		rules: {
+			// Browser ESM entry files must always include the file extension in relative imports.
+			"import-x/extensions": ["error", "always"]
+		}
+	},
 	{
 		files: ["**/*.js"],
 		ignores: [
diff --git a/index.html b/index.html
index dba2552069..806fcc34f7 100644
--- a/index.html
+++ b/index.html
@@ -43,7 +43,6 @@
     <div class="region fullscreen above"><div class="container"></div></div>
     <script type="text/javascript" src="socket.io/socket.io.js"></script>
     <script type="text/javascript" src="node_modules/nunjucks/browser/nunjucks.min.js"></script>
-    <script type="text/javascript" src="js/defaults.js"></script>
     <script type="text/javascript" src="js/vendor.js"></script>
     <script type="text/javascript" src="defaultmodules/defaultmodules.js"></script>
     <script type="text/javascript" src="defaultmodules/utils.js"></script>
@@ -52,7 +51,6 @@
     <script type="text/javascript" src="config/basepath.js"></script>
     <script type="text/javascript" src="js/animateCSS.js"></script>
     <script type="text/javascript" src="js/positions.js"></script>
-    <script type="module" src="js/module.js"></script>
     <script type="module" src="js/main.js"></script>
   </body>
 </html>
diff --git a/js/main.js b/js/main.js
index a13e11b41c..a9ab5b8382 100644
--- a/js/main.js
+++ b/js/main.js
@@ -1,8 +1,8 @@
-/* global addAnimateCSS, removeAnimateCSS, AnimateCSSIn, AnimateCSSOut, modulePositions, io */
+/* global addAnimateCSS, removeAnimateCSS, AnimateCSSIn, AnimateCSSOut, modulePositions */
 
-// eslint-disable-next-line import-x/extensions
+// Ensure Module global bridge is initialized before main bootstrap logic runs.
+import "./module.js";
 import { loadModules } from "./loader.js";
-// eslint-disable-next-line import-x/extensions
 import { Translator } from "./translator.js";
 
 let modules = [];
@@ -593,8 +593,9 @@ export const MM = {
 		createDomObjects();
 
 		// Setup global socket listener for RELOAD event (watch mode)
-		if (typeof io !== "undefined") {
-			const socket = io("/", {
+		const ioClient = globalThis.io;
+		if (typeof ioClient !== "undefined") {
+			const socket = ioClient("/", {
 				path: `${config.basePath || "/"}socket.io`
 			});
 
diff --git a/js/module.js b/js/module.js
index 9f4d0d8520..8ce48b2b84 100644
--- a/js/module.js
+++ b/js/module.js
@@ -1,10 +1,5 @@
-/* global nunjucks */
-
-// eslint-disable-next-line import-x/extensions
 import { loadFileForModule } from "./loader.js";
-// eslint-disable-next-line import-x/extensions
 import { MMSocket } from "./socketclient.js";
-// eslint-disable-next-line import-x/extensions
 import { Translator } from "./translator.js";
 
 /*
@@ -166,13 +161,15 @@ export class Module {
 			return this._nunjucksEnvironment;
 		}
 
-		this._nunjucksEnvironment = new nunjucks.Environment(new nunjucks.WebLoader(this.file(""), { async: true }), {
+		const nunjucksEngine = globalThis.nunjucks;
+
+		this._nunjucksEnvironment = new nunjucksEngine.Environment(new nunjucksEngine.WebLoader(this.file(""), { async: true }), {
 			trimBlocks: true,
 			lstripBlocks: true
 		});
 
 		this._nunjucksEnvironment.addFilter("translate", (str, variables) => {
-			return nunjucks.runtime.markSafe(this.translate(str, variables));
+			return nunjucksEngine.runtime.markSafe(this.translate(str, variables));
 		});
 
 		return this._nunjucksEnvironment;
diff --git a/js/socketclient.js b/js/socketclient.js
index 9a2dfbfd98..bf793c9698 100644
--- a/js/socketclient.js
+++ b/js/socketclient.js
@@ -1,18 +1,18 @@
-/* global io */
-
 export const MMSocket = function (moduleName) {
 	if (typeof moduleName !== "string") {
 		throw new Error("Please set the module name for the MMSocket.");
 	}
 
+	const ioClient = globalThis.io;
+	if (typeof ioClient !== "function") {
+		throw new Error("socket.io client is not available.");
+	}
+
 	this.moduleName = moduleName;
 
 	// Private Methods
-	let base = "/";
-	if (typeof config !== "undefined" && typeof config.basePath !== "undefined") {
-		base = config.basePath;
-	}
-	this.socket = io(`/${this.moduleName}`, {
+	const base = globalThis.config?.basePath ?? "/";
+	this.socket = ioClient(`/${this.moduleName}`, {
 		path: `${base}socket.io`,
 		pingInterval: 120000, // send pings every 2 mins
 		pingTimeout: 120000 // wait up to 2 mins for a pong