diff --git a/content/treestyletab/treestyletab.js b/content/treestyletab/treestyletab.js
index 20152cfa..583f1c27 100644
--- a/content/treestyletab/treestyletab.js
+++ b/content/treestyletab/treestyletab.js
@@ -1778,19 +1778,14 @@ catch(e) {
 	
 	cleanUpTabsArray : function(aTabs) 
 	{
-		var b = this.getTabBrowserFromChild(aTabs[0]);
-
-		aTabs = aTabs.map(function(aTab) {
-				return aTab.getAttribute(this.kID);
-			}, this);
-		aTabs.sort();
-		aTabs = aTabs.join('|').replace(/([^\|]+)(\|\1)+/g, '$1').split('|');
-
-		for (var i = 0, maxi = aTabs.length; i < maxi; i++)
-		{
-			aTabs[i] = b.treeStyleTab.getTabById(aTabs[i]);
-		}
-		return aTabs;
+		var newTabs = [];
+		aTabs.forEach(function(aTab) {
+			if (newTabs.indexOf(aTab) < 0) newTabs.push(aTab);
+		});
+		newTabs.sort(function(aA, aB) {
+			return aA._tPos - aB._tPos;
+		});
+		return newTabs;
 	},
   
 	bookmarkTabSubTree : function(aTabOrTabs) 
diff --git a/tests/unit/treestyletab_tabUtils.test.js b/tests/unit/treestyletab_tabUtils.test.js
index 5d8cf88f..d327b3a3 100644
--- a/tests/unit/treestyletab_tabUtils.test.js
+++ b/tests/unit/treestyletab_tabUtils.test.js
@@ -226,12 +226,17 @@ function test_setAndGetTabValue()
 	assertSetAndGetTabValue(tabs[2], 'tab2');
 }
 
+function test_cleanUpTabsArray()
+{
+	var array = [0, 1, 2, 1, 3, 0]
+			.map(function(aIndex) {
+				return tabs[aIndex]
+			});
+	assert.equals(tabs, Array.slice(sv.cleanUpTabsArray(array)));
+}
+
 
 /*
-
-sv.cleanUpTabsArray(tabs)
-
-
 sv.registerAttachTabPostProcess(func)
 sv.registerTabFocusAllowance(func)