diff --git a/modules/autoHide.js b/modules/autoHide.js
index cc746039..40b9e8f4 100644
--- a/modules/autoHide.js
+++ b/modules/autoHide.js
@@ -34,7 +34,7 @@
  *
  * ***** END LICENSE BLOCK ******/
  
-const EXPORTED_SYMBOLS = ['AutoHideBrowser', 'AutoHideWindow'];
+var EXPORTED_SYMBOLS = ['AutoHideBrowser', 'AutoHideWindow'];
 
 const DEBUG = false;
 
diff --git a/modules/base.js b/modules/base.js
index 3b0e3851..5cc921cc 100644
--- a/modules/base.js
+++ b/modules/base.js
@@ -34,7 +34,7 @@
  *
  * ***** END LICENSE BLOCK ******/
  
-const EXPORTED_SYMBOLS = ['TreeStyleTabBase']; 
+var EXPORTED_SYMBOLS = ['TreeStyleTabBase']; 
 
 const Cc = Components.classes;
 const Ci = Components.interfaces;
diff --git a/modules/browser.js b/modules/browser.js
index 87100517..580af5f8 100644
--- a/modules/browser.js
+++ b/modules/browser.js
@@ -36,7 +36,7 @@
  *
  * ***** END LICENSE BLOCK ******/
  
-const EXPORTED_SYMBOLS = ['TreeStyleTabBrowser']; 
+var EXPORTED_SYMBOLS = ['TreeStyleTabBrowser']; 
 
 const DEBUG = false;
 
diff --git a/modules/browserUIShowHideObserver.js b/modules/browserUIShowHideObserver.js
index 9fc4cb08..8ecbe747 100644
--- a/modules/browserUIShowHideObserver.js
+++ b/modules/browserUIShowHideObserver.js
@@ -34,7 +34,7 @@
  *
  * ***** END LICENSE BLOCK ******/
 
-const EXPORTED_SYMBOLS = ['BrowserUIShowHideObserver']; 
+var EXPORTED_SYMBOLS = ['BrowserUIShowHideObserver']; 
 
 var DEBUG = false;
 
diff --git a/modules/constants.js b/modules/constants.js
index 063ad90e..3f169b9c 100644
--- a/modules/constants.js
+++ b/modules/constants.js
@@ -34,7 +34,7 @@
  *
  * ***** END LICENSE BLOCK ******/
  
-const EXPORTED_SYMBOLS = ['TreeStyleTabConstants']; 
+var EXPORTED_SYMBOLS = ['TreeStyleTabConstants']; 
 
 var TreeStyleTabConstants = Object.freeze({
 /* attributes */
diff --git a/modules/contentBridge.js b/modules/contentBridge.js
index 8a90fd77..a7c0f699 100644
--- a/modules/contentBridge.js
+++ b/modules/contentBridge.js
@@ -33,7 +33,7 @@
  *
  * ***** END LICENSE BLOCK ******/
  
-const EXPORTED_SYMBOLS = ['ContentBridge']; 
+var EXPORTED_SYMBOLS = ['ContentBridge']; 
 
 const DEBUG = false;
 
diff --git a/modules/fullTooltip.js b/modules/fullTooltip.js
index 7962f2f7..9457d87b 100644
--- a/modules/fullTooltip.js
+++ b/modules/fullTooltip.js
@@ -34,7 +34,7 @@
  *
  * ***** END LICENSE BLOCK ******/
 
-const EXPORTED_SYMBOLS = ['FullTooltipManager'];
+var EXPORTED_SYMBOLS = ['FullTooltipManager'];
 
 const Cc = Components.classes;
 const Ci = Components.interfaces;
diff --git a/modules/fullscreenObserver.js b/modules/fullscreenObserver.js
index 368eb87d..324f2821 100644
--- a/modules/fullscreenObserver.js
+++ b/modules/fullscreenObserver.js
@@ -33,7 +33,7 @@
  *
  * ***** END LICENSE BLOCK ******/
 
-const EXPORTED_SYMBOLS = ['FullscreenObserver']; 
+var EXPORTED_SYMBOLS = ['FullscreenObserver']; 
 
 Components.utils.import('resource://treestyletab-modules/utils.js');
 
diff --git a/modules/groupTab.js b/modules/groupTab.js
index c53725e3..080f1b4a 100644
--- a/modules/groupTab.js
+++ b/modules/groupTab.js
@@ -34,7 +34,7 @@
  *
  * ***** END LICENSE BLOCK ******/
 
-const EXPORTED_SYMBOLS = ['GroupTab']; 
+var EXPORTED_SYMBOLS = ['GroupTab']; 
 
 const Cc = Components.classes;
 const Ci = Components.interfaces;
diff --git a/modules/lib/inherit.jsm b/modules/lib/inherit.jsm
index 72ce6257..cb7730e9 100644
--- a/modules/lib/inherit.jsm
+++ b/modules/lib/inherit.jsm
@@ -10,7 +10,7 @@
  * @url http://github.com/piroor/fxaddonlib-inherit
  */
 
-const EXPORTED_SYMBOLS = ['inherit'];
+var EXPORTED_SYMBOLS = ['inherit'];
 
 function toPropertyDescriptors(aProperties) {
 	var descriptors = {};
diff --git a/modules/pseudoTreeBuilder.js b/modules/pseudoTreeBuilder.js
index de5ecf90..5907d54e 100644
--- a/modules/pseudoTreeBuilder.js
+++ b/modules/pseudoTreeBuilder.js
@@ -34,7 +34,7 @@
  *
  * ***** END LICENSE BLOCK ******/
 
-const EXPORTED_SYMBOLS = ['PseudoTreeBuilder'];
+var EXPORTED_SYMBOLS = ['PseudoTreeBuilder'];
 
 const Cc = Components.classes;
 const Ci = Components.interfaces;
diff --git a/modules/tabAttributesObserver.js b/modules/tabAttributesObserver.js
index 7f81598a..8a622314 100644
--- a/modules/tabAttributesObserver.js
+++ b/modules/tabAttributesObserver.js
@@ -33,7 +33,7 @@
  *
  * ***** END LICENSE BLOCK ******/
 
-const EXPORTED_SYMBOLS = ['TabAttributesObserver']; 
+var EXPORTED_SYMBOLS = ['TabAttributesObserver']; 
 
 Components.utils.import('resource://treestyletab-modules/constants.js');
 
diff --git a/modules/tabbarDNDObserver.js b/modules/tabbarDNDObserver.js
index dfd2598c..c4a53411 100644
--- a/modules/tabbarDNDObserver.js
+++ b/modules/tabbarDNDObserver.js
@@ -35,7 +35,7 @@
  *
  * ***** END LICENSE BLOCK ******/
  
-const EXPORTED_SYMBOLS = ['TabbarDNDObserver']; 
+var EXPORTED_SYMBOLS = ['TabbarDNDObserver']; 
 
 const DEBUG = false;
 
diff --git a/modules/tabpanelDNDObserver.js b/modules/tabpanelDNDObserver.js
index 69689c53..838df36b 100644
--- a/modules/tabpanelDNDObserver.js
+++ b/modules/tabpanelDNDObserver.js
@@ -34,7 +34,7 @@
  *
  * ***** END LICENSE BLOCK ******/
  
-const EXPORTED_SYMBOLS = ['TabpanelDNDObserver'];
+var EXPORTED_SYMBOLS = ['TabpanelDNDObserver'];
 
 const Cc = Components.classes;
 const Ci = Components.interfaces;
diff --git a/modules/themeManager.js b/modules/themeManager.js
index 1cc1105d..26126a67 100644
--- a/modules/themeManager.js
+++ b/modules/themeManager.js
@@ -34,7 +34,7 @@
  *
  * ***** END LICENSE BLOCK ******/
  
-const EXPORTED_SYMBOLS = ['TreeStyleTabThemeManager']; 
+var EXPORTED_SYMBOLS = ['TreeStyleTabThemeManager']; 
 
 const BASE = 'chrome://treestyletab/skin/';
 
diff --git a/modules/window.js b/modules/window.js
index 424f3460..577296d5 100644
--- a/modules/window.js
+++ b/modules/window.js
@@ -34,7 +34,7 @@
  *
  * ***** END LICENSE BLOCK ******/
  
-const EXPORTED_SYMBOLS = ['TreeStyleTabWindow']; 
+var EXPORTED_SYMBOLS = ['TreeStyleTabWindow']; 
 
 const Cc = Components.classes;
 const Ci = Components.interfaces;