diff --git a/content/treestyletab/res/tabsDragUtils.js b/content/treestyletab/res/tabsDragUtils.js
index 208d42f0..d0bfa367 100644
--- a/content/treestyletab/res/tabsDragUtils.js
+++ b/content/treestyletab/res/tabsDragUtils.js
@@ -98,7 +98,7 @@
 		initTabDNDObserver : function TDU_initTabDNDObserver(aObserver)
 		{
 			if ('_setEffectAllowedForDataTransfer' in aObserver &&
-				aObserver._setEffectAllowedForDataTransfer.toSource().indexOf('tabDragUtils') < 0) {
+				aObserver._setEffectAllowedForDataTransfer.toSource().indexOf('tabsDragUtils') < 0) {
 				eval('aObserver._setEffectAllowedForDataTransfer = '+
 					aObserver._setEffectAllowedForDataTransfer.toSource().replace(
 						'dt.mozItemCount > 1',
@@ -108,7 +108,7 @@
 			}
 
 			if ('_animateTabMove' in aObserver &&
-				aObserver._animateTabMove.toSource().indexOf('tabDragUtils') < 0) {
+				aObserver._animateTabMove.toSource().indexOf('tabsDragUtils') < 0) {
 				eval('aObserver._animateTabMove = '+
 					aObserver._animateTabMove.toSource().replace( // support vertical tab bar
 						/\.screenX/g,
diff --git a/content/treestyletab/windowHelperHacks.js b/content/treestyletab/windowHelperHacks.js
index d43b98fa..a44ab9cb 100644
--- a/content/treestyletab/windowHelperHacks.js
+++ b/content/treestyletab/windowHelperHacks.js
@@ -101,7 +101,7 @@ TreeStyleTabWindowHelper.overrideExtensionsPreInit = function TSTWH_overrideExte
 					'    }' +
 					'    tabsInfo[this.permaTabs[index].id] = info;' +
 					'  }' +
-					'  TST.setTreePref('permaTabsInfo', tabsInfo.toSource());' +
+					'  TST.setTreePref("permaTabsInfo", tabsInfo.toSource());' +
 					'}).call(this);'
 				)
 			);