diff --git a/js/amd-public-path.js b/js/amd-public-path.js
new file mode 100644
index 00000000..e03476a0
--- /dev/null
+++ b/js/amd-public-path.js
@@ -0,0 +1,8 @@
+// In an AMD module, we set the public path using the magic requirejs 'module' dependency
+// See https://github.com/requirejs/requirejs/wiki/Differences-between-the-simplified-CommonJS-wrapper-and-standard-AMD-define#module
+// Since 'module' is a requirejs magic module, we must include 'module' in the webpack externals configuration.
+var module = require('module');
+var url = new URL(module.uri, document.location);
+// Using lastIndexOf('/')+1 gives us the empty string if there is no '/', so pathname becomes '/'
+url.pathname = url.pathname.slice(0,url.pathname.lastIndexOf('/')+1);
+__webpack_public_path__ = `${url.origin}${url.pathname}`;
diff --git a/js/package.json b/js/package.json
index 91917399..310b703f 100644
--- a/js/package.json
+++ b/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "jupyter-threejs",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "description": "jupyter - threejs bridge",
   "keywords": [
     "jupyterlab",
diff --git a/js/src/_base/Renderable.js b/js/src/_base/Renderable.js
index 38e67d02..680d101e 100644
--- a/js/src/_base/Renderable.js
+++ b/js/src/_base/Renderable.js
@@ -197,8 +197,8 @@ class RenderableView extends widgets.DOMWidgetView {
         }
     }
 
-    processPhosphorMessage(msg) {
-        widgets.DOMWidgetView.prototype.processPhosphorMessage.call(this, msg);
+    _processLuminoMessage(msg, _super) {
+        _super.call(this, msg);
         switch (msg.type) {
         case 'after-attach':
             this.el.addEventListener('contextmenu', this, true);
@@ -209,6 +209,14 @@ class RenderableView extends widgets.DOMWidgetView {
         }
     }
 
+    processPhosphorMessage(msg) {
+        this._processLuminoMessage(msg, widgets.DOMWidgetView.prototype.processPhosphorMessage);
+    }
+
+    processLuminoMessage(msg) {
+        this._processLuminoMessage(msg, widgets.DOMWidgetView.prototype.processLuminoMessage);
+    }
+
     handleEvent(event) {
         switch (event.type) {
         case 'contextmenu':
diff --git a/js/src/extension.js b/js/src/extension.js
index ffcc2e3b..4ddf6199 100644
--- a/js/src/extension.js
+++ b/js/src/extension.js
@@ -1,12 +1,4 @@
 // Entry point for the notebook bundle containing custom model definitions.
-//
-// Setup notebook base URL
-//
-// Some static assets may be required by the custom widget javascript. The base
-// url for the notebook is not known at build time and is therefore computed
-// dynamically.
-__webpack_public_path__ = document.querySelector('body').getAttribute('data-base-url') + 'nbextensions/jupyter-threejs/';
-
 
 // Configure requirejs
 if (window.requirejs) {
diff --git a/js/webpack.config.js b/js/webpack.config.js
index b81b6deb..650b16b6 100644
--- a/js/webpack.config.js
+++ b/js/webpack.config.js
@@ -1,6 +1,6 @@
 const path = require('path');
 
-const externals = ['@jupyter-widgets/base', 'three'];
+const externals = ['@jupyter-widgets/base', 'three', 'module'];
 
 module.exports = [
     {
@@ -17,11 +17,12 @@ module.exports = [
     },
     {
         // jupyter-threejs bundle for the notebook
-        entry: './src/index.js',
+        entry: ['./amd-public-path.js', './src/index.js'],
         output: {
             filename: 'index.js',
             path: path.resolve(__dirname, '..', 'pythreejs', 'static'),
-            libraryTarget: 'amd'
+            libraryTarget: 'amd',
+            publicPath: '', // Set in amd-public-path.js
         },
         devtool: 'source-map',
         externals: externals,
@@ -32,14 +33,15 @@ module.exports = [
     },
     {
         // embeddable jupyter-threejs bundle (e.g. for docs)
-        entry: './src/index.js',
+        entry: ['./amd-public-path.js', './src/index.js'],
         output: {
             filename: 'index.js',
             path: path.resolve(__dirname, 'dist'),
             library: 'jupyter-threejs',
-            libraryTarget: 'amd'
+            libraryTarget: 'amd',
+            publicPath: '', // Set in amd-public-path.js
         },
-        externals: ['@jupyter-widgets/base'],
+        externals: ['@jupyter-widgets/base', 'module'],
         resolve: {
             extensions: [ '.autogen.js', '.js' ]
         },
diff --git a/pythreejs/_version.py b/pythreejs/_version.py
index 5373fc84..64636cdf 100644
--- a/pythreejs/_version.py
+++ b/pythreejs/_version.py
@@ -1,4 +1,4 @@
-version_info = (2, 4, 1, 'final')
+version_info = (2, 4, 3, 'dev')
 
 _specifier_ = {'alpha': 'a', 'beta': 'b', 'candidate': 'rc', 'final': '', 'dev': 'dev'}
 
@@ -20,4 +20,4 @@
 # the widget models, or if the serialized format changes.
 #
 # The major version needs to match that of the JS package.
-EXTENSION_SPEC_VERSION = '^2.1.0'
+EXTENSION_SPEC_VERSION = '^2.4.1'
diff --git a/setupbase.py b/setupbase.py
index 13c926b1..44a02aa2 100644
--- a/setupbase.py
+++ b/setupbase.py
@@ -659,7 +659,7 @@ def _translate_glob(pat):
         translated_parts.append(_translate_glob_part(part))
     os_sep_class = '[%s]' % re.escape(SEPARATORS)
     res = _join_translated(translated_parts, os_sep_class)
-    return '{res}\\Z(?ms)'.format(res=res)
+    return '(?ms){res}\\Z'.format(res=res)
 
 
 def _join_translated(translated_parts, os_sep_class):