diff --git a/modules/animationManager.js b/modules/animationManager.js
index bf5bffa8..50b28053 100644
--- a/modules/animationManager.js
+++ b/modules/animationManager.js
@@ -26,7 +26,8 @@
 
 /* To work as a JS Code Module (*require jstimer.jsm)
    http://www.cozmixng.org/repos/piro/fx3-compatibility-lib/trunk/jstimer.jsm */
-if (typeof window == 'undefined') {
+if (typeof window == 'undefined' ||
+	(window && typeof window.constructor == 'function')) {
 	this.EXPORTED_SYMBOLS = ['animationManager'];
 
 	// If namespace.jsm is available, export symbols to the shared namespace.
diff --git a/modules/autoScroll.js b/modules/autoScroll.js
index 095a730c..229b17fa 100644
--- a/modules/autoScroll.js
+++ b/modules/autoScroll.js
@@ -13,7 +13,8 @@
 */
 
 /* To work as a JS Code Module */
-if (typeof window == 'undefined') {
+if (typeof window == 'undefined' ||
+	(window && typeof window.constructor == 'function')) {
 	this.EXPORTED_SYMBOLS = ['autoScroll'];
 
 	// If namespace.jsm is available, export symbols to the shared namespace.
diff --git a/modules/boxObject.js b/modules/boxObject.js
index 019e7108..119611dd 100644
--- a/modules/boxObject.js
+++ b/modules/boxObject.js
@@ -16,7 +16,8 @@
 */
 
 /* To work as a JS Code Module */
-if (typeof window == 'undefined') {
+if (typeof window == 'undefined' ||
+	(window && typeof window.constructor == 'function')) {
 	this.EXPORTED_SYMBOLS = ['boxObject'];
 
 	// If namespace.jsm is available, export symbols to the shared namespace.
diff --git a/modules/extensions.js b/modules/extensions.js
index b66b40e6..74c4b7ab 100644
--- a/modules/extensions.js
+++ b/modules/extensions.js
@@ -27,7 +27,8 @@
 */
 
 /* To work as a JS Code Module */
-if (typeof window == 'undefined') {
+if (typeof window == 'undefined' ||
+	(window && typeof window.constructor == 'function')) {
 	this.EXPORTED_SYMBOLS = ['extensions'];
 
 	// If namespace.jsm is available, export symbols to the shared namespace.
diff --git a/modules/prefs.js b/modules/prefs.js
index 1d7d3ed0..41d3184c 100644
--- a/modules/prefs.js
+++ b/modules/prefs.js
@@ -27,7 +27,8 @@
 */
 
 /* To work as a JS Code Module  */
-if (typeof window == 'undefined') {
+if (typeof window == 'undefined' ||
+	(window && typeof window.constructor == 'function')) {
 	this.EXPORTED_SYMBOLS = ['prefs'];
 
 	// If namespace.jsm is available, export symbols to the shared namespace.
diff --git a/modules/stringBundle.js b/modules/stringBundle.js
index 75322c87..a40e850f 100644
--- a/modules/stringBundle.js
+++ b/modules/stringBundle.js
@@ -15,7 +15,8 @@
 */
 
 /* To work as a JS Code Module */
-if (typeof window == 'undefined') {
+if (typeof window == 'undefined' ||
+	(window && typeof window.constructor == 'function')) {
 	this.EXPORTED_SYMBOLS = ['stringBundle'];
 
 	// If namespace.jsm is available, export symbols to the shared namespace.