diff --git a/content/treestyletab/treestyletabbrowser.js b/content/treestyletab/treestyletabbrowser.js
index d200c0e5..709393c2 100644
--- a/content/treestyletab/treestyletabbrowser.js
+++ b/content/treestyletab/treestyletabbrowser.js
@@ -1243,6 +1243,9 @@ TreeStyleTabBrowser.prototype = {
 			this.mTabBrowser.getAttribute(this.kFIXED) != 'true') {
 			strip.setAttribute('layer', true); // https://bugzilla.mozilla.org/show_bug.cgi?id=590468
 
+			if (this.autoHide.expanded && (aReason & this.kTABBAR_UPDATE_SYNC_TO_PLACEHOLDER))
+				this.autoHide.hide();
+
 			let box = this._tabStripPlaceHolder.boxObject;
 			let root = document.documentElement.boxObject;
 
diff --git a/modules/utils.js b/modules/utils.js
index 33eeb6ed..43dd8f07 100644
--- a/modules/utils.js
+++ b/modules/utils.js
@@ -188,7 +188,7 @@ var TreeStyleTabUtils = {
 	kTABBAR_UPDATE_BY_PRIVATE_BROWSING  : (1 << 8),
 	kTABBAR_UPDATE_BY_AUTOHIDE          : (1 << 9),
 	kTABBAR_UPDATE_BY_INITIALIZE        : (1 << 10),
-	kTABBAR_UPDATE_NOW                 : (1 << 5) | (1 << 9) | (1 << 10),
+	kTABBAR_UPDATE_NOW                 : (1 << 5) | (1 << 6) | (1 << 9) | (1 << 10),
 	kTABBAR_UPDATE_SYNC_TO_TABBAR      : (1 << 0) | (1 << 1) | (1 << 2) | (1 << 5) | (1 << 8) | (1 << 9),
 	kTABBAR_UPDATE_SYNC_TO_PLACEHOLDER : (1 << 3) | (1 << 4) | (1 << 6) | (1 << 7) | (1 << 10),