diff --git a/content/treestyletab/treestyletabbrowser.js b/content/treestyletab/treestyletabbrowser.js
index 72ab3add..d200c0e5 100644
--- a/content/treestyletab/treestyletabbrowser.js
+++ b/content/treestyletab/treestyletabbrowser.js
@@ -644,6 +644,8 @@ TreeStyleTabBrowser.prototype = {
 
 		this.autoHide;
 
+		this.updateFloatingTabbar(this.kTABBAR_UPDATE_BY_INITIALIZE);
+
 		this.fireTabbarPositionEvent(false, 'top', position); /* PUBLIC API */
 
 		b = null;
diff --git a/modules/utils.js b/modules/utils.js
index 22964206..8ece049c 100644
--- a/modules/utils.js
+++ b/modules/utils.js
@@ -183,9 +183,10 @@ var TreeStyleTabUtils = {
 	kTABBAR_UPDATE_BY_FULLSCREEN        : (1 << 7),
 	kTABBAR_UPDATE_BY_PRIVATE_BROWSING  : (1 << 8),
 	kTABBAR_UPDATE_BY_AUTOHIDE          : (1 << 9),
-	kTABBAR_UPDATE_NOW                 : (1 << 5) | (1 << 9),
+	kTABBAR_UPDATE_BY_INITIALIZE        : (1 << 10),
+	kTABBAR_UPDATE_NOW                 : (1 << 5) | (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),
+	kTABBAR_UPDATE_SYNC_TO_PLACEHOLDER : (1 << 3) | (1 << 4) | (1 << 6) | (1 << 7) | (1 << 10),
 
 	MAX_TABBAR_SIZE_RATIO        : 0.8,
 	DEFAULT_SHRUNKEN_WIDTH_RATIO : 0.67,