optimize: reduce use of Iterator

content/treestyletab/bookmarksOverlay.js

@@ -52,16 +52,18 @@ var TreeStyleTabBookmarksService = {
 			return;
 		}
 
-		for (let [, item] in Iterator(aBookarmks))
+		for (let i = 0, maxi = aBookarmks.length; i < maxi; i++)
 		{
+			let item = aBookarmks[i];
 			item.position = this.BookmarksService.getItemIndex(item.id);
 		}
 		aBookarmks.sort(function(aA, aB) {
 			return aA.position - aB.position;
 		});
 
-		for (let [i, item] in Iterator(aBookarmks))
+		for (let i = 0, maxi = aBookarmks.length; i < maxi; i++)
 		{
+			let item = aBookarmks[i];
 			if (this.BookmarksService.getItemType(item.id) != this.BookmarksService.TYPE_BOOKMARK)
 				continue;
 
@@ -104,8 +106,9 @@ var TreeStyleTabBookmarksService = {
 
 		var b = this.getTabBrowserFromChild(tabs[0]);
 		var bookmarkedTabs = [];
-		for (let [i, tab] in Iterator(tabs))
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
+			let tab = tabs[i];
 			if (!this.isGroupTab(tab, i == 0)) bookmarkedTabs.push(tab);
 			bookmarkedTabs = bookmarkedTabs.concat(b.treeStyleTab.getDescendantTabs(tab));
 		}
@@ -360,8 +363,10 @@ var TreeStyleTabBookmarksService = {
 						TreeStyleTabBookmarksService.beginAddBookmarksFromTabs((function() {
 							var tabs = [];
 							var seen = {};
-							for (let [, tab] in Iterator(getBrowser().mTabContainer.childNodes))
+							var allTabs = getBrowser().mTabContainer.childNodes;
+							for (let i = 0, maxi = allTabs.length; i < maxi; i++)
 							{
+								let tab = allTabs[i];
 								let uri = tab.linkedBrowser.currentURI.spec;
 								if (uri in seen) continue;
 								seen[uri] = true;

content/treestyletab/config.js

@@ -185,13 +185,15 @@ function onSyncGroupBookmarkUIToPref()
 	if (gGroupBookmarkUnderParent.checked) behavior |= 256;
 	if (gGroupBookmarkType.value == 'true') behavior |= 512;
 
-	for (let [, node] in Iterator([
+	var nodes = [
 			gGroupBookmarkUnderParent,
 			gGroupBookmarkType,
 			gGroupBookmarkType.previousSibling,
 			gGroupBookmarkType.nextSibling
-		]))
+		];
+	for (let i = 0, maxi = nodes.length; i < maxi; i++)
 	{
+		let node = nodes[i];
 		if (behavior & 1)
 			node.removeAttribute('disabled');
 		else

content/treestyletab/windowHelper.js

@@ -201,15 +201,17 @@ var TreeStyleTabWindowHelper = {
 			);
 		}
 
-		for (let [, func] in Iterator(this._splitFunctionNames(<![CDATA[
+		let (functions = this._splitFunctionNames(<![CDATA[
 				window.duplicateTab.handleLinkClick
 				window.duplicatethistab.handleLinkClick
 				window.__treestyletab__highlander__origHandleLinkClick
 				window.__splitbrowser__handleLinkClick
 				window.__ctxextensions__handleLinkClick
 				window.handleLinkClick
-			]]>)))
+			]]>)) {
+			for (let i = 0, maxi = functions.length; i < maxi; i++)
 			{
+				let func = functions[i];
 				let source = this._getFunctionSource(func);
 				if (!source || !/^\(?function handleLinkClick/.test(source))
 					continue;
@@ -219,6 +221,7 @@ var TreeStyleTabWindowHelper = {
 				));
 				break;
 			}
+		}
 
 		if ('openLinkIn' in window) {
 			eval('window.openLinkIn = '+
@@ -233,13 +236,15 @@ var TreeStyleTabWindowHelper = {
 			);
 		}
 
-		for (let [, func] in Iterator(this._splitFunctionNames(<![CDATA[
+		let (functions = this._splitFunctionNames(<![CDATA[
 				window.permaTabs.utils.wrappedFunctions["window.contentAreaClick"]
 				window.__contentAreaClick
 				window.__ctxextensions__contentAreaClick
 				window.contentAreaClick
-			]]>)))
+			]]>)) {
+			for (let i = 0, maxi = functions.length; i < maxi; i++)
 			{
+				let func = functions[i];
 				let source = this._getFunctionSource(func);
 				if (!source || !/^\(?function contentAreaClick/.test(source))
 					continue;
@@ -252,8 +257,9 @@ var TreeStyleTabWindowHelper = {
 						$1]]>
 				));
 			}
+		}
 
-		for (let [, func] in Iterator(this._splitFunctionNames(<![CDATA[
+		let (functions = this._splitFunctionNames(<![CDATA[
 				window.duplicateTab.gotoHistoryIndex
 				window.duplicateTab.BrowserBack
 				window.duplicateTab.BrowserForward
@@ -265,8 +271,10 @@ var TreeStyleTabWindowHelper = {
 				window.gotoHistoryIndex
 				window.BrowserForward
 				window.BrowserBack
-			]]>)))
+			]]>)) {
+			for (let i = 0, maxi = functions.length; i < maxi; i++)
 			{
+				let func = functions[i];
 				let source = this._getFunctionSource(func);
 				if (!source || !/^\(?function (gotoHistoryIndex|BrowserForward|BrowserBack)/.test(source))
 					continue;
@@ -278,11 +286,14 @@ var TreeStyleTabWindowHelper = {
 						$1]]>
 				));
 			}
+		}
 
-		for (let [, func] in Iterator(this._splitFunctionNames(<![CDATA[
+		let (functions = this._splitFunctionNames(<![CDATA[
 				window.BrowserReloadOrDuplicate
-			]]>)))
+			]]>)) {
+			for (let i = 0, maxi = functions.length; i < maxi; i++)
 			{
+				let func = functions[i];
 				let source = this._getFunctionSource(func);
 				if (!source || !/^\(?function (BrowserReloadOrDuplicate)/.test(source))
 					continue;
@@ -294,13 +305,16 @@ var TreeStyleTabWindowHelper = {
 						$&]]>
 				));
 			}
+		}
 
-		for (let [, func] in Iterator(this._splitFunctionNames(<![CDATA[
+		let (functions = this._splitFunctionNames(<![CDATA[
 				permaTabs.utils.wrappedFunctions["window.BrowserHomeClick"]
 				window.BrowserHomeClick
 				window.BrowserGoHome
-			]]>)))
+			]]>)) {
+			for (let i = 0, maxi = functions.length; i < maxi; i++)
 			{
+				let func = functions[i];
 				let source = this._getFunctionSource(func);
 				if (!source || !/^\(?function (BrowserHomeClick|BrowserGoHome)/.test(source))
 					continue;
@@ -311,6 +325,7 @@ var TreeStyleTabWindowHelper = {
 						$&]]>
 				));
 			}
+		}
 
 		eval('FeedHandler.loadFeed = '+
 			FeedHandler.loadFeed.toSource().replace(

content/treestyletab/windowHelperHacks.js

@@ -86,13 +86,16 @@ TreeStyleTabWindowHelper.overrideExtensionsPreInit = function TSTWH_overrideExte
 						(function() {
 							var tabsInfo = {};
 							var TST = TreeStyleTabService;
-							for (let [, tab] in Iterator(getBrowser().mTabContainer.childNodes))
+							var allTabs = getBrowser().mTabContainer.childNodes;
+							for (let i = 0, maxi = allTabs.length; i < maxi; i++)
 							{
+								let tab = allTabs[i];
 								let index = this.getPermaTabLocalIndex(tab);
 								if (index < 0) continue;
 								let info = {};
-								for (let [, property] in Iterator(TST.extraProperties))
+								for (let i = 0, maxi = TST.extraProperties.length; i < maxi; i++)
 								{
+									let property = TST.extraProperties[i];
 									info[property] = TST.getTabValue(tab, property);
 								}
 								tabsInfo[this.permaTabs[index].id] = info;
@@ -125,8 +128,9 @@ TreeStyleTabWindowHelper.overrideExtensionsPreInit = function TSTWH_overrideExte
 				sessionData.getTabProperties.toSource().replace(
 					'return tabProperties;',
 					<![CDATA[
-						for (let [, property] in Iterator(this.tabTSTProperties))
+						for (let i = 0, maxi = this.tabTSTProperties.length; i < maxi; i++)
 						{
+							let tabProperties = this.tabTSTProperties[i];
 							tabProperties += '|' + property + '=' + encodeURIComponent(aTab.getAttribute(property));
 						}
 					$&]]>
@@ -138,8 +142,9 @@ TreeStyleTabWindowHelper.overrideExtensionsPreInit = function TSTWH_overrideExte
 					<![CDATA[$&
 						var TSTProps = tabProperties.split('|');
 						tabProperties = TSTProps.shift();
-						for (let [, property] in Iterator(TSTProps))
+						for (let i = 0, maxi = TSTProps.length; i < maxi; i++)
 						{
+							let property = TSTProps[i];
 							let index = property.indexOf('=');
 							let name = property.substring(0, index);
 							let value = decodeURIComponent(property.substring(index+1));
@@ -200,10 +205,13 @@ TreeStyleTabWindowHelper.overrideExtensionsPreInit = function TSTWH_overrideExte
 				'var tabcount = ',
 				<![CDATA[
 					gBrowser.treeStyleTab.collapseExpandAllSubtree(false, true);
-					for (let [, tab] in Iterator(gBrowser.treeStyleTab.getTabsArray(gBrowser).slice(1).reverse()))
+					let (tabs = gBrowser.treeStyleTab.getTabsArray(gBrowser).slice(1).reverse()) {
+						for (let i = 0, maxi = tabs.length; i < maxi; i++)
 						{
+							let tab = tabs[i];
 							gBrowser.removeTab(tab);
 						}
+					}
 					TreeStyleTabService.restoringTree = true;
 				$&]]>
 			));
@@ -214,8 +222,10 @@ TreeStyleTabWindowHelper.overrideExtensionsPreInit = function TSTWH_overrideExte
 	// https://addons.mozilla.org/firefox/addon/4650
 	if ('FS_onFullerScreen' in window &&
 		sv.getTreePref('compatibility.FullerScreen')) {
-		for (let [, func] in Iterator('CheckIfFullScreen,FS_onFullerScreen,FS_onMouseMove'.split(',')))
+		let (functions = 'CheckIfFullScreen,FS_onFullerScreen,FS_onMouseMove'.split(',')) {
+			for (let i = 0, maxi = functions.length; i < maxi; i++)
 			{
+				let func = functions[i];
 				if (!(func in window)) continue;
 				eval('window.'+func+' = '+window[func].toSource().replace(
 					/FS_data.mTabs.(removeAttribute\("moz-collapsed"\)|setAttribute\("moz-collapsed", "true"\));/g,
@@ -223,6 +233,7 @@ TreeStyleTabWindowHelper.overrideExtensionsPreInit = function TSTWH_overrideExte
 				));
 			}
 		}
+	}
 
 	// TooManyTabs
 	// https://addons.mozilla.org/firefox/addon/9429
@@ -817,8 +828,10 @@ TreeStyleTabWindowHelper.overrideExtensionsAfterBrowserInit = function TSTWH_ove
 	if ('LinkyContext' in window &&
 		'prototype' in LinkyContext &&
 		sv.getTreePref('compatibility.Linky')) {
-		for (let [, method] in Iterator('doSelected,doSelectedText,doImages,doAll,doAllPics,doValidateAll,doValidateSelected'.split(',')))
+		let (methods = 'doSelected,doSelectedText,doImages,doAll,doAllPics,doValidateAll,doValidateSelected'.split(',')) {
+			for (let i = 0, maxi = methods.length; i < maxi; i++)
 			{
+				let method = methods[i];
 				if (!(method in LinkyContext.prototype)) continue;
 				eval('LinkyContext.prototype.'+method+' = '+
 					LinkyContext.prototype[method].toSource().replace(
@@ -831,6 +844,7 @@ TreeStyleTabWindowHelper.overrideExtensionsAfterBrowserInit = function TSTWH_ove
 				);
 			}
 		}
+	}
 
 	// QuickDrag
 	// https://addons.mozilla.org/firefox/addon/6912
@@ -1324,15 +1338,16 @@ TreeStyleTabWindowHelper.overrideExtensionsDelayed = function TSTWH_overrideExte
 								break;
 
 							case sv.kEVENT_TYPE_BEFORE_TOOLBAR_CUSTOMIZATION:
-								for (let [, toolbox] in Iterator(tabbarToolboxes))
+								for (let i = 0, maxi = tabbarToolboxes.length; i < maxi; i++)
 								{
-									toolbox.removeAttribute('collapsed');
+									tabbarToolboxes[i].removeAttribute('collapsed');
 								}
 								break;
 
 							case sv.kEVENT_TYPE_AFTER_TOOLBAR_CUSTOMIZATION:
-								for (let [, toolbox] in Iterator(tabbarToolboxes))
+								for (let i = 0, maxi = tabbarToolboxes.length; i < maxi; i++)
 								{
+									let toolbox = tabbarToolboxes[i];
 									if (!toolbox.firstChild.hasChildNodes())
 										toolbox.setAttribute('collapsed', true);
 								}
@@ -1352,8 +1367,9 @@ TreeStyleTabWindowHelper.overrideExtensionsDelayed = function TSTWH_overrideExte
 			document.addEventListener(sv.kEVENT_TYPE_BEFORE_TOOLBAR_CUSTOMIZATION, listener, false);
 			document.addEventListener(sv.kEVENT_TYPE_AFTER_TOOLBAR_CUSTOMIZATION, listener, false);
 			document.addEventListener('unload', listener, false);
-			for (let [, toolbox] in Iterator(tabbarToolboxes))
+			for (let i = 0, maxi = tabbarToolboxes.length; i < maxi; i++)
 			{
+				let toolbox = tabbarToolboxes[i];
 				if (!toolbox.firstChild.hasChildNodes())
 					toolbox.setAttribute('collapsed', true);
 			}

modules/browser.js

@@ -523,8 +523,9 @@ TreeStyleTabBrowser.prototype = {
 	{
 		var tabs = this.getTabsArray(this.mTabBrowser);
 		var count = tabs.length;
-		for (let [i, tab] in Iterator(tabs))
+		for (let i = 0; i < count; i++)
 		{
+			let tab = tabs[i];
 			if (aStacked)
 				tab.style.zIndex = count * 1000 - index;
 			else
@@ -721,7 +722,7 @@ TreeStyleTabBrowser.prototype = {
 		if (!('MultipleTabService' in w)) {
 			w.setTimeout(function(aSelf, aTabBrowser, aPopup) {
 				let suffix = '-tabbrowser-'+(aTabBrowser.id || 'instance-'+parseInt(Math.random() * 65000));
-				for (let [, id] in Iterator([
+				let ids = [
 						aSelf.kMENUITEM_RELOADSUBTREE,
 						aSelf.kMENUITEM_RELOADCHILDREN,
 						aSelf.kMENUITEM_REMOVESUBTREE,
@@ -734,8 +735,10 @@ TreeStyleTabBrowser.prototype = {
 						aSelf.kMENUITEM_AUTOHIDE,
 						aSelf.kMENUITEM_FIXED,
 						aSelf.kMENUITEM_BOOKMARKSUBTREE
-					]))
+					];
+				for (let i = 0, maxi = ids.length; i < maxi; i++)
 				{
+					let id = ids[i];
 					let item = d.getElementById(id).cloneNode(true);
 					item.setAttribute('id', item.getAttribute('id')+suffix);
 
@@ -973,13 +976,15 @@ TreeStyleTabBrowser.prototype = {
 		namedNodes.counterAnchor = namedNodes.label;
 
 		var foundContainers = [];
-		for (let [, container] in Iterator([
+		var containers = [
 				namedNodes.twistyAnchor.parentNode,
 				namedNodes.label.parentNode,
 				namedNodes.counter.parentNode,
 				namedNodes.closeAnchor.parentNode
-			]))
+			];
+		for (let i = 0, maxi = containers.length; i < maxi; i++)
 		{
+			let container = containers[i];
 			if (foundContainers.indexOf(container) > -1)
 				continue;
 			this.initTabContentsOrderInternal(container, namedNodes, aForce);
@@ -994,8 +999,9 @@ TreeStyleTabBrowser.prototype = {
 		var nodes = Array.slice(this.document.getAnonymousNodes(aContainer) || aContainer.childNodes);
 
 		// reset order at first!
-		for (let [i, node] in Iterator(nodes))
+		for (let i = 0, maxi = nodes.length; i < maxi; i++)
 		{
+			let node = nodes[i];
 			if (node.getAttribute('class') == 'informationaltab-thumbnail-container')
 				continue;
 			node.setAttribute('ordinal', i);
@@ -1030,8 +1036,9 @@ TreeStyleTabBrowser.prototype = {
 
 		var count = nodes.length;
 		nodes.reverse();
-		for (let [i, node] in Iterator(nodes))
+		for (let i = 0, maxi = nodes.length; i < maxi; i++)
 		{
+			let node = nodes[i];
 			if (node.getAttribute('class') == 'informationaltab-thumbnail-container')
 				continue;
 			node.setAttribute('ordinal', (count - i + 1) * 100);
@@ -1043,14 +1050,16 @@ TreeStyleTabBrowser.prototype = {
 			 * Gecko doesn't re-render them in the new order.
 			 * Changing of "display" or "position" can fix this problem.
 			 */
-			for (let [, node] in Iterator(nodes))
+			for (let i = 0, maxi = nodes.length; i < maxi; i++)
 			{
+				let node = nodes[i];
 				node.style.visibility = 'hidden'; // we should hide temporary state!
 				node.style.position = 'fixed';
 			}
 			this.Deferred.wait(0.1).next(function() {
-				for (let [, node] in Iterator(nodes))
+				for (let i = 0, maxi = nodes.length; i < maxi; i++)
 				{
+					let node = nodes[i];
 					node.style.position = '';
 					node.style.visibility = '';
 				}
@@ -1070,9 +1079,9 @@ TreeStyleTabBrowser.prototype = {
 					(typeof aTarget == 'object' && 'length' in aTarget) ?
 						Array.slice(aTarget) :
 						self.getAllTabsArray(b);
-			for (let [, tab] in Iterator(tabs))
+			for (let i = 0, maxi = tabs.length; i < maxi; i++)
 			{
-				this.initTabContentsOrder(tab);
+				this.initTabContentsOrder(tabs[i]);
 			}
 		});
 	},
@@ -1187,8 +1196,10 @@ TreeStyleTabBrowser.prototype = {
 			b.mPanelContainer.removeAttribute('height');
 
 			if (strip.localName == 'toolbar') {
-				for (let [, node] in Iterator(strip.childNodes))
+				let nodes = strip.childNodes;
+				for (let i = 0, maxi = nodes.length; i < maxi; i++)
 				{
+					let node = nodes[i];
 					if (node.localName == 'tabs')
 						continue;
 					if (node.hasAttribute('flex'))
@@ -1267,8 +1278,10 @@ TreeStyleTabBrowser.prototype = {
 			this.removeTabbrowserAttribute(this.kTAB_INVERTED);
 
 			if (strip.localName == 'toolbar') {
-				for (let [, node] in Iterator(strip.childNodes))
+				let nodes = strip.childNodes;
+				for (let i = 0, maxi = nodes.length; i < maxi; i++)
 				{
+					let node = nodes[i];
 					if (node.localName == 'tabs')
 						continue;
 					let flex = node.hasAttribute('treestyletab-backup-flex');
@@ -1302,8 +1315,9 @@ TreeStyleTabBrowser.prototype = {
 		}
 
 		var tabs = this.getAllTabsArray(b);
-		for (let [, tab] in Iterator(tabs))
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
+			let tab = tabs[i];
 			tab.style.removeProperty(this.indentCSSProp);
 			tab.style.removeProperty(this.collapseCSSProp);
 		}
@@ -1312,8 +1326,9 @@ TreeStyleTabBrowser.prototype = {
 		this.indentCSSProp = this.indentProp+'-'+this.indentTarget;
 		this.collapseCSSProp = 'margin-'+this.collapseTarget;
 
-		for (let [i, tab] in Iterator(tabs))
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
+			let tab = tabs[i];
 			this.updateTabCollapsed(tab, tab.getAttribute(this.kCOLLAPSED) == 'true', true);
 		}
 
@@ -1805,8 +1820,10 @@ TreeStyleTabBrowser.prototype = {
  
 	reinitAllTabs : function TSTBrowser_reinitAllTabs(aSouldUpdateCount) 
 	{
-		for (let [, tab] in Iterator(this.getAllTabsArray(this.mTabBrowser)))
+		var tabs = this.getAllTabsArray(this.mTabBrowser);
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
+			let tab = tabs[i];
 			this.initTabAttributes(tab);
 			this.initTabContents(tab);
 			if (aSouldUpdateCount)
@@ -1837,8 +1854,10 @@ TreeStyleTabBrowser.prototype = {
 		var b = this.mTabBrowser;
 		delete b.tabContainer.treeStyleTab;
 
-		for (let [, tab] in Iterator(this.getAllTabsArray(b)))
+		var tabs = this.getAllTabsArray(b);
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
+			let tab = tabs[i];
 			this.stopTabIndentAnimation(tab);
 			this.stopTabCollapseAnimation(tab);
 			this.destroyTab(tab);
@@ -2150,24 +2169,24 @@ TreeStyleTabBrowser.prototype = {
 			case 'extensions.treestyletab.tabbar.multirow':
 				this.initTabbar();
 				this.updateAllTabsIndent();
-				for (let [, tab] in Iterator(tabs))
+				for (let i = 0, maxi = tabs.length; i < maxi; i++)
 				{
-					this.initTabContents(tab);
+					this.initTabContents(tabs[i]);
 				}
 				return;
 			case 'extensions.treestyletab.tabbar.invertTabContents':
 				this.setTabbrowserAttribute(this.kTAB_CONTENTS_INVERTED, value);
-				for (let [, tab] in Iterator(tabs))
+				for (let i = 0, maxi = tabs.length; i < maxi; i++)
 				{
-					this.initTabContents(tab);
+					this.initTabContents(tabs[i]);
 				}
 				return;
 
 			case 'extensions.treestyletab.tabbar.invertClosebox':
 				this.setTabbrowserAttribute(this.kCLOSEBOX_INVERTED, value);
-				for (let [, tab] in Iterator(tabs))
+				for (let i = 0, maxi = tabs.length; i < maxi; i++)
 				{
-					this.initTabContents(tab);
+					this.initTabContents(tabs[i]);
 				}
 				return;
 
@@ -2714,9 +2733,10 @@ TreeStyleTabBrowser.prototype = {
 
 				this.markAsClosedSet([tab].concat(tabs));
 
-				for (let [, tab] in Iterator(tabs.reverse()))
+				tabs.reverse();
+				for (let i = 0, maxi = tabs.length; i < maxi; i++)
 				{
-					b.removeTab(tab, { animate : true });
+					b.removeTab(tabs[i], { animate : true });
 				}
 
 				this.fireTabSubtreeClosedEvent(b, tab, tabs);
@@ -2903,8 +2923,9 @@ TreeStyleTabBrowser.prototype = {
 
 		var self = this;
 		this.Deferred.next(function() {
-			for (let [, tabs] in Iterator(trees))
+			for (let i = 0, maxi = trees.length; i < maxi; i++)
 			{
+				let tabs = trees[i];
 				self.fireTabSubtreeClosedEvent(b, tabs[0], tabs);
 			}
 		});
@@ -3129,8 +3150,9 @@ TreeStyleTabBrowser.prototype = {
 					return aB._tPos - aA._tPos;
 				})
 				.filter(aSelf.restoreOneTab, aSelf);
-			for (let [, tab] in Iterator(restoreTabs))
+			for (let i = 0, maxi = restoreTabs.length; i < maxi; i++)
 			{
+				let tab = restoreTabs[i];
 				aSelf.updateInsertionPositionInfo(tab);
 				delete tab.__treestyletab__restoreState;
 			}
@@ -3189,8 +3211,9 @@ TreeStyleTabBrowser.prototype = {
 		var lastIndex = allTabs.length - 1;
 		var lastMovedTab;
 		normalTabs = normalTabs.slice(0).reverse();
-		for (let [, tab] in Iterator(normalTabs))
+		for (let i = 0, maxi = normalTabs.length; i < maxi; i++)
 		{
+			let tab = normalTabs[i];
 			let parent = this.getParentTab(tab);
 			let attached = false;
 			if (parent && (tab.hidden != parent.hidden)) {
@@ -3257,8 +3280,9 @@ TreeStyleTabBrowser.prototype = {
 		this.detachTab(aParent);
 		b.moveTabTo(aParent, lastCount);
 		var descendantTabs = this.getDescendantTabs(aParent);
-		for (let [, tab] in Iterator(descendantTabs))
+		for (let i = 0, maxi = descendantTabs.length; i < maxi; i++)
 		{
+			let tab = descendantTabs[i];
 			w.TabView.moveTabTo(tab, id);
 			b.moveTabTo(tab, lastCount);
 		}
@@ -3453,14 +3477,16 @@ TreeStyleTabBrowser.prototype = {
 		 * For failsafe, we must override actual attributes by stored
 		 * values.
 		 */
-		for (let [, key] in Iterator([
+		var keys = [
 				this.kINSERT_BEFORE,
 				this.kINSERT_AFTER
-			]))
+			];
+		for (let i = 0, maxi = keys.length; i < maxi; i++)
 		{
+			let key = keys[i];
 			let tab = this.getTabValue(aTab, key);
 			if (this.getTabById(tab))
-				this.setTabValue(aTab, aKey, tab);
+				this.setTabValue(aTab, key, tab);
 		}
 
 		let parentId = this.getTabValue(aTab, this.kPARENT);
@@ -3516,8 +3542,9 @@ TreeStyleTabBrowser.prototype = {
 				return this.redirectId(aChild);
 			}, this);
 
-		for (let [, childTab] in Iterator(aChildrenList))
+		for (let i = 0, maxi = aChildrenList.length; i < maxi; i++)
 		{
+			let childTab = aChildrenList[i];
 			if (childTab && (childTab = this.getTabById(childTab))) {
 				let options = aOptions;
 				if (options && typeof options == 'function')
@@ -3647,10 +3674,10 @@ TreeStyleTabBrowser.prototype = {
 
 		var children = aTab.getAttribute(this.kCHILDREN);
 		if (restoringChildren != children) {
-			var restoringChildrenIDs = restoringChildren.split('|');
+			var restoringChildrenIDs = restoringChildren.split('|').reverse();
-			for (let [i, child] in Iterator(restoringChildrenIDs.reverse()))
+			for (let i = 0, maxi = restoringChildrenIDs.length; i < maxi; i++)
 			{
-				child = this.getTabById(child);
+				let child = this.getTabById(restoringChildrenIDs[i]);
 				if (!child) continue;
 
 				let nextTab = i > 0 ?
@@ -3708,8 +3735,10 @@ TreeStyleTabBrowser.prototype = {
 			return;
 
 		var indexes = [];
-		for (let [i, item] in Iterator(this.evalInSandbox('('+this.SessionStore.getClosedTabData(this.window)+')')))
+		var items = this.evalInSandbox('('+this.SessionStore.getClosedTabData(this.window)+')');
+		for (let i = 0, maxi = items.length; i < maxi; i++)
 		{
+			let item = items[i];
 			if (item.state.extData &&
 				item.state.extData[this.kCLOSED_SET_ID] &&
 				item.state.extData[this.kCLOSED_SET_ID] == aId)
@@ -3754,9 +3783,9 @@ TreeStyleTabBrowser.prototype = {
 		this.windowService.restoringTree = true;
 
 		var offset = 0;
-		for (let [, index] in Iterator(aIndexes))
+		for (let i = 0, maxi = aIndexes.length; i < maxi; i++)
 		{
-			this.window.undoCloseTab(index - (offset++));
+			this.window.undoCloseTab(aIndexes[i] - (offset++));
 		}
 
 		this.window.setTimeout(function(aSelf, aNextFocused) {
@@ -3791,8 +3820,10 @@ TreeStyleTabBrowser.prototype = {
 			 */
 			let b = this.browser;
 			this.internallyTabMovingCount++;
-			for (let [, childTab] in Iterator(this.getDescendantTabs(aTab).reverse()))
+			let children = this.getDescendantTabs(aTab).reverse();
+			for (let i = 0, maxi = children.length; i < maxi; i++)
 			{
+				let childTab = children[i];
 				if (childTab.__treestyletab__previousPosition > childTab._tPos)
 					b.moveTabTo(childTab, childTab.__treestyletab__previousPosition);
 			}
@@ -3806,8 +3837,10 @@ TreeStyleTabBrowser.prototype = {
 			 */
 			let b = this.browser;
 			this.internallyTabMovingCount++;
-			for (let [, childTab] in Iterator(this.getChildTabs(aTab).reverse()))
+			let children = this.getChildTabs(aTab).reverse();
+			for (let i = 0, maxi = children.length; i < maxi; i++)
 			{
+				let childTab = children[i];
 				if (childTab._tPos < parentTab._tPos)
 					b.moveTabTo(childTab, parentTab._tPos);
 			}
@@ -4195,7 +4228,7 @@ TreeStyleTabBrowser.prototype = {
 		var b = this.mTabBrowser;
 		var sep, items = {};
 
-		for (let [, id] in Iterator([
+		var ids = [
 				this.kMENUITEM_RELOADSUBTREE,
 				this.kMENUITEM_RELOADCHILDREN,
 				this.kMENUITEM_REMOVESUBTREE,
@@ -4206,8 +4239,10 @@ TreeStyleTabBrowser.prototype = {
 				this.kMENUITEM_AUTOHIDE,
 				this.kMENUITEM_FIXED,
 				this.kMENUITEM_BOOKMARKSUBTREE
-			]))
+			];
+		for (let i = 0, maxi = ids.length; i < maxi; i++)
 		{
+			let id = ids[i];
 			let item = this.evaluateXPath(
 				'descendant::xul:*[starts-with(@id, "'+id+'")]',
 				aEvent.currentTarget,
@@ -4405,9 +4440,10 @@ TreeStyleTabBrowser.prototype = {
   
 	resetAllTabs : function TSTBrowser_resetAllTabs(aDetachAllChildren) 
 	{
-		for (let [, tab] in Iterator(this.getAllTabsArray(this.mTabBrowser)))
+		var tabs = this.getAllTabsArray(this.mTabBrowser);
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
-			this.resetTab(tab, aDetachAllChildren);
+			this.resetTab(tabs[i], aDetachAllChildren);
 		}
 	},
  
@@ -4442,8 +4478,10 @@ TreeStyleTabBrowser.prototype = {
 				this.allowSubtreeCollapseExpand = true;
 			delete this._lastAllowSubtreeCollapseExpand;
 
-			for (let [, tab] in Iterator(this.getAllTabsArray(this.browser)))
+			let tabs = this.getAllTabsArray(this.browser);
+			for (let i = 0, maxi = tabs.length; i < maxi; i++)
 			{
+				let tab = tabs[i];
 				if (tab._TSTLastSubtreeCollapsed)
 					this.collapseExpandSubtree(tab, true, true);
 				if (tab._TSTLastSubtreeExpandedManually)
@@ -4455,8 +4493,10 @@ TreeStyleTabBrowser.prototype = {
 			this.updateTabsIndent(this.rootTabs, undefined, true);
 		}
 		else {
-			for (let [, tab] in Iterator(this.getAllTabsArray(this.browser)))
+			let tabs = this.getAllTabsArray(this.browser);
+			for (let i = 0, maxi = tabs.length; i < maxi; i++)
 			{
+				let tab = tabs[i];
 				this.updateTabIndent(tab, 0, true);
 				tab._TSTLastSubtreeCollapsed = this.isSubtreeCollapsed(tab);
 				tab._TSTLastSubtreeExpandedManually = this.getTabValue(tab, this.kSUBTREE_EXPANDED_MANUALLY) == 'true';
@@ -4717,8 +4757,9 @@ TreeStyleTabBrowser.prototype = {
 			!this.getTreePref('closeParentBehavior.moveDetachedTabsToBottom')) {
 			insertBefore = this.getNextSiblingTab(this.getRootTab(aTab));
 		}
-		for (let [i, tab] in Iterator(children))
+		for (let i = 0, maxi = children.length; i < maxi; i++)
 		{
+			let tab = children[i];
 			if (aInfo.behavior == this.kCLOSE_PARENT_BEHAVIOR_DETACH_ALL_CHILDREN) {
 				this.detachTab(tab, aInfo);
 				this.moveTabSubtreeTo(tab, insertBefore ? insertBefore._tPos - 1 : this.getLastTab(b)._tPos );
@@ -4763,8 +4804,9 @@ TreeStyleTabBrowser.prototype = {
  
 	detachTabs : function TSTBrowser_detachTabs(aTabs) 
 	{
-		for (let [, tab] in Iterator(aTabs))
+		for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 		{
+			let tab = aTabs[i];
 			if (aTabs.indexOf(this.getParentTab(tab)) > -1)
 				continue;
 			this.detachAllChildren(tab, {
@@ -4816,8 +4858,9 @@ TreeStyleTabBrowser.prototype = {
 			indent = Math.min(aLevel * 3, maxIndent);
 		}
 
-		for (let [, tab] in Iterator(aTabs))
+		for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 		{
+			let tab = aTabs[i];
 			if (!tab.parentNode) continue; // ignore removed tabs
 			this.updateTabIndent(tab, indent, aJustNow);
 			tab.setAttribute(this.kNEST, aLevel);
@@ -4833,8 +4876,9 @@ TreeStyleTabBrowser.prototype = {
 		this.updateTabsIndentWithDelayTabs = this.updateTabsIndentWithDelayTabs.concat(aTabs);
 		this.updateTabsIndentWithDelayTimer = this.window.setTimeout(function(aSelf) {
 			var tabs = [];
-			for (let [, tab] in Iterator(aSelf.updateTabsIndentWithDelayTabs))
+			for (let i = 0, maxi = aSelf.updateTabsIndentWithDelayTabs.length; i < maxi; i++)
 			{
+				let tab = aSelf.updateTabsIndentWithDelayTabs[i];
 				if (tabs.indexOf(tab) < 0 && tab.parentNode) tabs.push(tab);
 			}
 			aSelf.updateTabsIndentWithDelayTabs = [];
@@ -4866,8 +4910,10 @@ TreeStyleTabBrowser.prototype = {
 				retVal.push('ThreeDShadow');
 				return retVal.length == 1 ? 'none' : retVal.join(' ') ;
 			})()+' !important;';
-			for (let [, box] in Iterator(this.document.getAnonymousNodes(aTab)))
+			let boxes = this.document.getAnonymousNodes(aTab);
+			for (let i = 0, box = boxes.length; i < maxi; i++)
 			{
+				let box = boxes[i];
 				if (box.nodeType != Node.ELEMENT_NODE) continue;
 				box.setAttribute(
 					'style',
@@ -5051,8 +5097,10 @@ TreeStyleTabBrowser.prototype = {
  
 	updateAllTabsCount : function TSTBrowser_updateAllTabsCount() 
 	{
-		for (let [, tab] in Iterator(this.rootTabs))
+		var tabs = this.rootTabs;
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
+			let tab = tabs[i];
 			this.updateTabsCount(tab, this);
 		}
 	},
@@ -5062,7 +5110,8 @@ TreeStyleTabBrowser.prototype = {
 		if (this.maxTreeLevel < 0 || !this.maxTreeLevelPhisical)
 			return;
 
-		for (let [, tab] in Iterator(aParent ? this.getDescendantTabs(aParent) : this.getAllTabsArray(this.mTabBrowser) ))
+		var tabs = aParent ? this.getDescendantTabs(aParent) : this.getAllTabsArray(this.mTabBrowser) ;
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
 			let level = parseInt(tab.getAttribute(this.kNEST) || 0);
 			if (level <= this.maxTreeLevel)
@@ -5098,8 +5147,10 @@ TreeStyleTabBrowser.prototype = {
 
 		this.subTreeChildrenMovingCount++;
 		this.internallyTabMovingCount++;
-		for (let [i, descendantTab] in Iterator(this.getDescendantTabs(aTab)))
+		var descendantTabs = this.getDescendantTabs(aTab);
+		for (let i = 0, maxi = descendantTabs.length; i < maxi; i++)
 		{
+			let descendantTab = descendantTabs[i];
 			b.moveTabTo(descendantTab, aTab._tPos + i + (aTab._tPos < descendantTab._tPos ? 1 : 0 ));
 		}
 		this.internallyTabMovingCount--;
@@ -5312,8 +5363,9 @@ TreeStyleTabBrowser.prototype = {
 
 		var expandedTabs = this.getChildTabs(aTab);
 		var lastExpandedTabIndex = expandedTabs.length - 1;
-		for (let [i, childTab] in Iterator(expandedTabs))
+		for (let i = 0, maxi = expandedTabs.length; i < maxi; i++)
 		{
+			let childTab = expandedTabs[i];
 			if (!aCollapse && !aJustNow && i == lastExpandedTabIndex) {
 				let self = this;
 				this.collapseExpandTab(childTab, aCollapse, aJustNow, function() {
@@ -5366,9 +5418,10 @@ TreeStyleTabBrowser.prototype = {
 		}
 
 		if (!this.isSubtreeCollapsed(aTab)) {
-			for (let [, tab] in Iterator(this.getChildTabs(aTab)))
+			let tabs = this.getChildTabs(aTab);
+			for (let i = 0, maxi = tabs.length; i < maxi; i++)
 			{
-				this.collapseExpandTab(tab, aCollapse, aJustNow);
+				this.collapseExpandTab(tabs[i], aCollapse, aJustNow);
 			}
 		}
 	},
@@ -5881,8 +5934,9 @@ TreeStyleTabBrowser.prototype = {
 		if (tabs.length <= 1)
 			return;
 
-		for (let [, tab] in Iterator(tabs))
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
+			let tab = tabs[i];
 			let currentId = tab.getAttribute(this.kID);
 			if (this.tabsHash[currentId] == tab)
 				delete this.tabsHash[currentId];

modules/fullTooltip.js

@@ -413,8 +413,9 @@ FullTooltipManager.prototype = {
 		if (aExtraLabels) {
 			if (typeof aExtraLabels == 'string')
 				aExtraLabels = [aExtraLabels];
-			for (let [, label] in Iterator(aExtraLabels))
+			for (let i = 0, maxi = aExtraLabels.length; i < maxi; i++)
 			{
+				let label = aExtraLabels[i];
 				label = label.replace(/^\s+|\s+$/g, '');
 				if (!label)
 					continue;

modules/pseudoTreeBuilder.js

@@ -127,9 +127,9 @@ var PseudoTreeBuilder = {
 			return null;
 
 		var container = doc.createElement('vbox');
-		for (let [, child] in Iterator(children))
+		for (let i = 0, maxi = children.length; i < maxi; i++)
 		{
-			container.appendChild(this.createTabItem(child));
+			container.appendChild(this.createTabItem(children[i]));
 		}
 		container.setAttribute('class', this.kTREECHILDREN);
 		return container;

modules/tabbarDNDObserver.js

@@ -414,11 +414,13 @@ catch(e) {
 		var tabs = sv.getTabsArray(targetBrowser);
 
 		var draggedWholeTree = [].concat(draggedRoots);
-		for (let [, root] in Iterator(draggedRoots))
+		for (let i = 0, maxi = draggedRoots.length; i < maxi; i++)
 		{
+			let root = draggedRoots[i];
 			let tabs = sourceService.getDescendantTabs(root);
-			for (let [, tab] in Iterator(tabs))
+			for (let i = 0, maxi = tabs.length; i < maxi; i++)
 			{
+				let tab = tabs[i];
 				if (draggedWholeTree.indexOf(tab) < 0)
 					draggedWholeTree.push(tab);
 			}
@@ -515,8 +517,9 @@ catch(e) {
 		var sv = b.treeStyleTab;
 
 		b.movingSelectedTabs = true; // Multiple Tab Handler
-		for (let [, tab] in Iterator(aTabs))
+		for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 		{
+			let tab = aTabs[i];
 			if (!tab.parentNode) continue; // ignore removed tabs
 			if (aParent)
 				sv.attachTabTo(tab, aParent);
@@ -533,8 +536,9 @@ catch(e) {
 		var sv = b.treeStyleTab;
 
 		b.movingSelectedTabs = true; // Multiple Tab Handler
-		for (let [, tab] in Iterator(aTabs))
+		for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 		{
+			let tab = aTabs[i];
 			if (!tab.parentNode) continue; // ignore removed tabs
 			sv.detachTab(tab);
 			sv.collapseExpandTab(tab, false);
@@ -863,9 +867,9 @@ catch(e) {
 		var sv = this.treeStyleTab;
 		if (this.mAutoExpandedTabs.length) {
 			if (sv.getTreePref('autoExpand.collapseFinally')) {
-				for (let [, target] in Iterator(this.mAutoExpandedTabs))
+				for (let i = 0, maxi = this.mAutoExpandedTabs.length; i < maxi; i++)
 				{
-					sv.collapseExpandSubtree(sv.getTabById(target), true, true);
+					sv.collapseExpandSubtree(sv.getTabById(this.mAutoExpandedTabs[i]), true, true);
 				}
 			}
 			this.mAutoExpandedTabs = [];

modules/themeManager.js

@@ -54,8 +54,9 @@ TreeStyleTabThemeManager.prototype = {
 	set : function(aStyle, aPosition)
 	{
 		if (this._lastStyles) {
-			for (let [, style] in Iterator(this._lastStyles))
+			for (let i = 0, maxi = this._lastStyles.length; i < maxi; i++)
 			{
+				let style = this._lastStyles[i];
 				style.parentNode.removeChild(style);
 			}
 		}
@@ -130,8 +131,9 @@ TreeStyleTabThemeManager.prototype = {
 				null ;
 		if (!images) return;
 
-		for (let [, image] in Iterator(images))
+		for (let i = 0, maxi = images.length; i < maxi; i++)
 		{
+			let image = images[i];
 			if (this._preLoadImagesForStyleDoneImages.indexOf(image) > -1)
 				continue;
 

modules/utils.js

@@ -394,14 +394,18 @@ var TreeStyleTabUtils = {
 	{
 		var OS = this.XULAppInfo.OS;
 		var processed = {};
-		for (let [, originalKey] in Iterator(this.getDescendant('extensions.treestyletab.platform.'+OS)))
+		var originalKeys = this.getDescendant('extensions.treestyletab.platform.'+OS);
+		for (let i = 0, maxi = originalKeys.length; i < maxi; i++)
 		{
+			let originalKey = originalKeys[i];
 			let key = originalKey.replace('platform.'+OS+'.', '');
 			this.setDefaultPref(key, this.getPref(originalKey));
 			processed[key] = true;
 		}
-		for (let [, originalKey] in Iterator(this.getDescendant('extensions.treestyletab.platform.default')))
+		originalKeys = this.getDescendant('extensions.treestyletab.platform.default');
+		for (let i = 0, maxi = originalKeys.length; i < maxi; i++)
 		{
+			let originalKey = originalKeys[i];
 			let key = originalKey.replace('platform.default.', '');
 			if (!(key in processed))
 				this.setDefaultPref(key, this.getPref(originalKey));
@@ -713,8 +717,9 @@ var TreeStyleTabUtils = {
 	doAndWaitDOMEvent : function TSTUtils_doAndWaitDOMEvent() 
 	{
 		var type, target, delay, task;
-		for (let [, arg] in Iterator(arguments))
+		for (let i = 0, maxi = arguments.length; i < maxi; i++)
 		{
+			let arg = arguments[i];
 			switch(typeof arg)
 			{
 				case 'string':
@@ -928,8 +933,9 @@ var TreeStyleTabUtils = {
 	fireDataContainerEvent : function TSTUtils_fireDataContainerEvent()
 	{
 		var target, document, type, data, canBubble, cancellable;
-		for (let [, arg] in Iterator(arguments))
+		for (let i = 0, maxi = arguments.length; i < maxi; i++)
 		{
+			let arg = arguments[i];
 			if (typeof arg == 'boolean') {
 				if (canBubble === void(0))
 					canBubble = arg;
@@ -952,8 +958,11 @@ var TreeStyleTabUtils = {
 
 		var event = document.createEvent('DataContainerEvent');
 		event.initEvent(type, canBubble, cancellable);
-		for (let [property, value] in Iterator(data))
+		var properties = Object.keys(data);
+		for (let i = 0, maxi = properties.length; i < maxi; i++)
 		{
+			let property = properties[i];
+			let value = data[property];
 			event.setData(property, value);
 			event[property] = value; // for backward compatibility
 		}
@@ -1131,18 +1140,18 @@ var TreeStyleTabUtils = {
 	{
 		if (!aTabs || aTabs.length <= 1) return;
 		var id = this.makeNewClosedSetId() + '::' + aTabs.length;
-		for (let [, tab] in Iterator(aTabs))
+		for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 		{
-			this.setTabValue(tab, this.kCLOSED_SET_ID, id);
+			this.setTabValue(aTabs[i], this.kCLOSED_SET_ID, id);
 		}
 	},
  
 	unmarkAsClosedSet : function TSTUtils_unmarkAsClosedSet(aTabs) /* PUBLIC API */ 
 	{
 		if (!aTabs || !aTabs.length) return;
-		for (let [, tab] in Iterator(aTabs))
+		for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 		{
-			this.deleteTabValue(tab, this.kCLOSED_SET_ID);
+			this.deleteTabValue(aTabs[i], this.kCLOSED_SET_ID);
 		}
 	},
  
@@ -1281,8 +1290,9 @@ var TreeStyleTabUtils = {
 		var b = aTabBrowser || this.browser;
 		var top = aFrame.top;
 		var tabs = this.getAllTabsArray(b);
-		for (let [, tab] in Iterator(tabs))
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
+			let tab = tabs[i];
 			if (tab.linkedBrowser.contentWindow == top)
 				return tab;
 		}
@@ -1321,8 +1331,9 @@ var TreeStyleTabUtils = {
 	cleanUpTabsArray : function TSTUtils_cleanUpTabsArray(aTabs) 
 	{
 		var newTabs = [];
-		for (let [, tab] in Iterator(aTabs))
+		for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 		{
+			let tab = aTabs[i];
 			if (!tab || !tab.parentNode) continue; // ignore removed tabs
 			if (newTabs.indexOf(tab) < 0) newTabs.push(tab);
 		}
@@ -1357,8 +1368,10 @@ var TreeStyleTabUtils = {
 		var groups = [];
 
 		var group = [];
-		for (let [, tab] in Iterator(this.cleanUpTabsArray(aTabs)))
+		aTabs = this.cleanUpTabsArray(aTabs);
+		for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 		{
+			let tab = aTabs[i];
 			let parent = this.getParentTab(tab);
 			if (!parent || group.indexOf(parent) < 0) {
 				if (group.length) groups.push(group);
@@ -2324,8 +2337,9 @@ var TreeStyleTabUtils = {
 		var collapsedStates = aTabs.map(function(aTab) {
 				return this.getTabValue(aTab, this.kSUBTREE_COLLAPSED) == 'true';
 			}, this);
-		for (let [, tab] in Iterator(aTabs))
+		for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 		{
+			let tab = aTabs[i];
 			this.collapseExpandSubtree(tab, false, true);
 			this.collapseExpandTab(tab, false, true);
 		}
@@ -2392,8 +2406,9 @@ var TreeStyleTabUtils = {
 		while (aExpandStates.length < aTabs.length) aExpandStates.push(-1);
 
 		var parentTab = null;
-		for (let [i, tab] in Iterator(aTabs))
+		for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 		{
+			let tab = aTabs[i];
 			if (sv.isCollapsed(tab)) sv.collapseExpandTab(tab, false, true);
 			sv.detachTab(tab);
 

modules/window.js

@@ -375,7 +375,7 @@ TreeStyleTabWindow.prototype = {
 					this.setPref('browser.tabs.loadFolderAndReplace', !!(behavior & this.kGROUP_BOOKMARK_REPLACE));
 				}
 			case 4:
-				for (let [, pref] in Iterator([
+				let (prefs = [
 						'extensions.treestyletab.autoCollapseExpandSubTreeOnSelect',
 						'extensions.treestyletab.autoCollapseExpandSubTreeOnSelect.onCurrentTabRemove',
 						'extensions.treestyletab.autoCollapseExpandSubTreeOnSelect.whileFocusMovingByShortcut',
@@ -388,13 +388,16 @@ TreeStyleTabWindow.prototype = {
 						'extensions.treestyletab.show.context-item-bookmarkTabSubTree',
 						'extensions.multipletab.show.multipletab-selection-item-removeTabSubTree',
 						'extensions.multipletab.show.multipletab-selection-item-createSubTree'
-					]))
+					]) {
+					for (let i = 0, maxi = pref.length; i < maxi; i++)
 					{
+						let pref = prefs[i];
 						let value = this.getPref(pref);
 						if (value === null) continue;
 						this.setPref(pref.replace('SubTree', 'Subtree'), value);
 						this.clearPref(pref);
 					}
+				}
 			case 5:
 				let (behavior = this.getTreePref('openGroupBookmark.behavior')) {
 					behavior = behavior | 2048;
@@ -411,8 +414,9 @@ TreeStyleTabWindow.prototype = {
 						this.setTreePref('autoAttach.searchResult', search);
 				}
 			default:
-				for (let [, pref] in Iterator(orientalPrefs))
+				for (let i = 0, maxi = orientalPrefs.length; i < maxi; i++)
 				{
+					let pref = orientalPrefs[i];
 					let value = this.getPref(pref);
 					if (value === null) continue;
 					this.setPref(pref+'.horizontal', value);
@@ -501,12 +505,15 @@ TreeStyleTabWindow.prototype = {
 				}
 
 				if (!prefs) return;
-				for (let [, pref] in Iterator([
+
+				let restorePrefs = [
 						'browser.tabs.loadFolderAndReplace',
 						'browser.tabs.insertRelatedAfterCurrent',
 						'extensions.stm.tabBarMultiRows' // Super Tab Mode
-					]))
+					];
+				for (let i = 0, maxi = pref.length; i < maxi; i++)
 				{
+					let pref = restorePrefs[i];
 					let backup = prefs.getPref(pref+'.backup');
 					if (backup === null) continue;
 					prefs.setPref(pref+'.override', backup); // we have to set to ".override" pref, to avoid unexpectedly reset by the preference listener.
@@ -552,8 +559,9 @@ TreeStyleTabWindow.prototype = {
 		var items = Array.slice(aEvent.originalTarget.childNodes);
 		var firstItemIndex = 0;
 		// ignore menu items inserted by Weave (Firefox Sync), Tab Utilities, and others.
-		for (let [i, item] in Iterator(items))
+		for (let i = 0, maxi = items.length; i < maxi; i++)
 		{
+			let item = items[i];
 			if (
 				item.getAttribute('anonid') ||
 				item.id ||
@@ -565,9 +573,10 @@ TreeStyleTabWindow.prototype = {
 		items = items.slice(firstItemIndex);
 
 		var b = this.getTabBrowserFromChild(aEvent.originalTarget) || this.browser;
-		for (let [i, tab] in Iterator(this.getTabsArray(b)))
+		var tabs = this.getTabsArray(b);
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
-			items[i].style.marginLeft = tab.getAttribute(this.kNEST)+'em';
+			items[i].style.marginLeft = tabs[i].getAttribute(this.kNEST)+'em';
 		}
 	},
   
@@ -599,9 +608,9 @@ TreeStyleTabWindow.prototype = {
 				d.removeEventListener(this.kEVENT_TYPE_TABBAR_STATE_CHANGED,        this, false);
 				d.removeEventListener(this.kEVENT_TYPE_FOCUS_NEXT_TAB,              this, false);
 
-				for (let [, listener] in Iterator(this._tabFocusAllowance))
+				for (let i = 0, maxi = this._tabFocusAllowance.length; i < maxi; i++)
 				{
-					w.removeEventListener(this.kEVENT_TYPE_FOCUS_NEXT_TAB, listener, false);
+					w.removeEventListener(this.kEVENT_TYPE_FOCUS_NEXT_TAB, this._tabFocusAllowance[i], false);
 				}
 
 				var appcontent = d.getElementById('appcontent');
@@ -1060,8 +1069,10 @@ TreeStyleTabWindow.prototype = {
 
 		this.AeroPeek.windows.some(function(aTabWindow) {
 			if (aTabWindow.win == this.window) {
-				for (let [, preview] in Iterator(aTabWindow.previews))
+				let previews = aTabWindow.previews;
+				for (let i = 0, maxi = previews.length; i < maxi; i++)
 				{
+					let preview = previews[i];
 					if (!preview) continue;
 					let tab = preview.controller.wrappedJSObject.tab;
 					preview.visible = !this.isCollapsed(tab);
@@ -1211,8 +1222,9 @@ TreeStyleTabWindow.prototype = {
  
 	processRestoredTabs : function TSTWindow_processRestoredTabs() 
 	{
-		for (let [, tab] in Iterator(this._restoringTabs))
+		for (let i = 0, maxi = this._restoringTabs.length; i < maxi; i++)
 		{
+			let tab = this._restoringTabs[i];
 			try {
 				let b = this.getTabBrowserFromChild(aTab);
 				if (b) b.treeStyleTab.handleRestoredTab(aTab);
@@ -1280,8 +1292,10 @@ TreeStyleTabWindow.prototype = {
 		if (aOnlyChildren)
 			tabs = this.gatherSubtreeMemberTabs(aTabOrTabs);
 
-		for (let [, subtreeTabs] in Iterator(this.splitTabsToSubtrees(tabs)))
+		var allSubtrees = this.splitTabsToSubtrees(tabs);
+		for (let i = 0, maxi = allSubtrees.length; i < maxi; i++)
 		{
+			let subtreeTabs = allSubtrees[i];
 			if (!this.fireTabSubtreeClosingEvent(subtreeTabs[0], subtreeTabs))
 				continue;
 			let b = this.getTabBrowserFromChild(subtreeTabs[0]);
@@ -1397,8 +1411,9 @@ TreeStyleTabWindow.prototype = {
 					aTabs.shift() ;
 		var self = this;
 		this.Deferred.next(function(self) {
-			for (let [, tab] in Iterator(aTabs))
+			for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 			{
+				let tab = aTabs[i];
 				b.treeStyleTab.attachTabTo(tab, root);
 				b.treeStyleTab.collapseExpandTab(tab, false);
 			}
@@ -1435,8 +1450,9 @@ TreeStyleTabWindow.prototype = {
 		var roots = [];
 		if (!aTabs || !aTabs.length) return roots;
 		aTabs = this.cleanUpTabsArray(aTabs);
-		for (let [, tab] in Iterator(aTabs))
+		for (let i = 0, maxi = aTabs.length; i < maxi; i++)
 		{
+			let tab = aTabs[i];
 			let parent = this.getParentTab(tab);
 			if (parent && aTabs.indexOf(parent) > -1) continue;
 			roots.push(tab);
@@ -1518,9 +1534,10 @@ TreeStyleTabWindow.prototype = {
 
 		this.stopRendering();
 		this.markAsClosedSet(closeTabs);
-		for (let [, tab] in Iterator(closeTabs.reverse()))
+		var tabs = closeTabs.reverse();
+		for (let i = 0, maxi = tabs.length; i < maxi; i++)
 		{
-			b.removeTab(tab);
+			b.removeTab(tabs[i]);
 		}
 		this.startRendering();
 	},