diff --git a/modules/browser.js b/modules/browser.js
index 8e7de013..850b1343 100644
--- a/modules/browser.js
+++ b/modules/browser.js
@@ -2086,15 +2086,19 @@ TreeStyleTabBrowser.prototype = inherit(TreeStyleTabWindow.prototype, {
 		else
 			this.positionPinnedTabsWithDelay(null, null, aReason & this.kTABBAR_UPDATE_BY_AUTOHIDE);
 
+		this.notifyingRenderedEvent = true;
 		var event = d.createEvent('Events');
 		event.initEvent(this.kEVENT_TYPE_TABBAR_RENDERED, true, false);
 		this.mTabBrowser.tabContainer.dispatchEvent(event);
 
-		if (!collapsed && aReason & this.kTABBAR_UPDATE_BY_AUTOHIDE)
-			setTimeout((function() {
-				if (this.browser) // ignore calling after destroyed...
+		setTimeout((function() {
+			this.notifyingRenderedEvent = false;
+
+			if (!collapsed &&
+				aReason & this.kTABBAR_UPDATE_BY_AUTOHIDE &&
+				this.browser) // ignore calling after destroyed...
 					this.scrollToTab(this.browser.selectedTab);
-			}).bind(this), 0);
+		}).bind(this), 0);
 	},
 	getTabbarPlaceholderSize: function TSTBrowser_getTabbarPlaceholderSize()
 	{
diff --git a/modules/browserUIShowHideObserver.js b/modules/browserUIShowHideObserver.js
index 5b71e096..1698024a 100644
--- a/modules/browserUIShowHideObserver.js
+++ b/modules/browserUIShowHideObserver.js
@@ -105,7 +105,9 @@ BrowserUIShowHideObserver.prototype = {
 
 	onAttributeModified : function BrowserUIShowHideObserver_onAttributeModified(aMutation, aObserver) 
 	{
-		if (this.handlingAttrChange)
+		var TST = this.owner.browser.treeStyleTab;
+		if (this.handlingAttrChange ||
+			TST.notifyingRenderedEvent)
 			return;
 
 		var target = aMutation.target;
@@ -113,7 +115,6 @@ BrowserUIShowHideObserver.prototype = {
 		if (target.__treestyletab_mutationObserver_lastState == state)
 			return;
 
-		var TST = this.owner.browser.treeStyleTab;
 		if (
 			// ignore modifications of each tab
 			TST.getTabFromChild(target) ||
diff --git a/modules/fullscreenObserver.js b/modules/fullscreenObserver.js
index 6d700317..0f351918 100644
--- a/modules/fullscreenObserver.js
+++ b/modules/fullscreenObserver.js
@@ -84,6 +84,7 @@ FullscreenObserver.prototype = {
 	onSizeModeChange : function FullscreenObserver_onSizeModeChange()
 	{
 		this.updateToolboxPosition();
+		if (!this.window.gBrowser.treeStyleTab.notifyingRenderedEvent)
 		this.window.gBrowser.treeStyleTab.updateFloatingTabbar(TreeStyleTabConstants.kTABBAR_UPDATE_BY_WINDOW_RESIZE);
 	},
 	updateToolboxPosition : function FullscreenObserver_onSizeModeChange()