diff --git a/content/treestyletab/treestyletab.js b/content/treestyletab/treestyletab.js
index e7a21d0f..bdaf2ee4 100644
--- a/content/treestyletab/treestyletab.js
+++ b/content/treestyletab/treestyletab.js
@@ -1019,7 +1019,7 @@ catch(e) {
 
 		/* PUBLIC API */
 		let event = document.createEvent('Events');
-		event.initEvent('TreeStyleTabFocusSwitchingKeyDown', true, true);
+		event.initEvent('TreeStyleTabFocusSwitchingKeyDown', true, false);
 		event.sourceEvent = aEvent;
 		this.browser.dispatchEvent(event);
 	},
@@ -1061,7 +1061,7 @@ catch(e) {
 			) {
 			/* PUBLIC API */
 			let event = document.createEvent('Events');
-			event.initEvent('TreeStyleTabFocusSwitchingStart', true, true);
+			event.initEvent('TreeStyleTabFocusSwitchingStart', true, false);
 			event.scrollDown = scrollDown;
 			event.scrollUp = scrollUp;
 			event.standBy = standBy;
@@ -1076,7 +1076,7 @@ catch(e) {
 		/* PUBLIC API */
 		let (event) {
 			event = document.createEvent('Events');
-			event.initEvent('TreeStyleTabFocusSwitchingEnd', true, true);
+			event.initEvent('TreeStyleTabFocusSwitchingEnd', true, false);
 			event.scrollDown = scrollDown;
 			event.scrollUp = scrollUp;
 			event.standBy = standBy;
diff --git a/content/treestyletab/treestyletabbrowser.js b/content/treestyletab/treestyletabbrowser.js
index 2a6c1e24..dbb018b6 100644
--- a/content/treestyletab/treestyletabbrowser.js
+++ b/content/treestyletab/treestyletabbrowser.js
@@ -1072,7 +1072,7 @@ TreeStyleTabBrowser.prototype = {
 		if (aOldPosition == aNewPosition) return;
 
 		var event = document.createEvent('Events');
-		event.initEvent(aType, true, true);
+		event.initEvent(aType, true, false);
 		event.oldPosition = aOldPosition;
 		event.newPosition = aNewPosition;
 		this.mTabBrowser.dispatchEvent(event);
@@ -3076,7 +3076,7 @@ TreeStyleTabBrowser.prototype = {
 			) {
 			/* PUBLIC API */
 			let event = document.createEvent('Events');
-			event.initEvent('TreeStyleTabAttached', true, true);
+			event.initEvent('TreeStyleTabAttached', true, false);
 			event.parentTab = aParent;
 			aChild.dispatchEvent(event);
 			return;
@@ -3182,7 +3182,7 @@ TreeStyleTabBrowser.prototype = {
 
 		/* PUBLIC API */
 		var event = document.createEvent('Events');
-		event.initEvent('TreeStyleTabAttached', true, true);
+		event.initEvent('TreeStyleTabAttached', true, false);
 		event.parentTab = aParent;
 		aChild.dispatchEvent(event);
 	},
@@ -3223,7 +3223,7 @@ TreeStyleTabBrowser.prototype = {
 
 		/* PUBLIC API */
 		var event = document.createEvent('Events');
-		event.initEvent('TreeStyleTabParted', true, true);
+		event.initEvent('TreeStyleTabParted', true, false);
 		aChild.dispatchEvent(event);
 
 		if (this.isGroupTab(parentTab) && !this.hasChildTabs(parentTab)) {
@@ -3567,7 +3567,7 @@ TreeStyleTabBrowser.prototype = {
 
 		/* PUBLIC API */
 		var event = document.createEvent('Events');
-		event.initEvent('TreeStyleTabCollapsedStateChange', true, true);
+		event.initEvent('TreeStyleTabCollapsedStateChange', true, false);
 		event.collapsed = aCollapse;
 		aTab.dispatchEvent(event);
 
diff --git a/content/treestyletab/treestyletabbrowser_autoHide.js b/content/treestyletab/treestyletabbrowser_autoHide.js
index 68b0251b..a3ca6f53 100644
--- a/content/treestyletab/treestyletabbrowser_autoHide.js
+++ b/content/treestyletab/treestyletabbrowser_autoHide.js
@@ -517,7 +517,7 @@ TreeStyleTabBrowserAutoHide.prototype = {
 	{
 		/* PUBLIC API */
 		var event = document.createEvent('Events');
-		event.initEvent('TreeStyleTabAutoHideStateChanging', true, true);
+		event.initEvent('TreeStyleTabAutoHideStateChanging', true, false);
 		event.shown = this.expanded;
 		event.state = this.state;
 		this.mOwner.mTabBrowser.dispatchEvent(event);
@@ -527,7 +527,7 @@ TreeStyleTabBrowserAutoHide.prototype = {
 	{
 		/* PUBLIC API */
 		var event = document.createEvent('Events');
-		event.initEvent('TreeStyleTabAutoHideStateChange', true, true);
+		event.initEvent('TreeStyleTabAutoHideStateChange', true, false);
 		event.shown = this.expanded;
 		event.state = this.state;
 		event.xOffset = this.XOffset;