diff --git a/content/treestyletab/config.xul b/content/treestyletab/config.xul
index 9301fcf1..0ea3aa62 100644
--- a/content/treestyletab/config.xul
+++ b/content/treestyletab/config.xul
@@ -24,6 +24,12 @@
 		<preference id="extensions.treestyletab.tabbar.style"
 			name="extensions.treestyletab.tabbar.style"
 			type="string"/>
+		<preference id="extensions.treestyletab.tabbar.fixed.horizontal"
+			name="extensions.treestyletab.tabbar.fixed.horizontal"
+			type="bool"/>
+		<preference id="extensions.treestyletab.tabbar.syncRelatedPrefsForDynamicPosition"
+			name="extensions.treestyletab.tabbar.syncRelatedPrefsForDynamicPosition"
+			type="bool"/>
 		<preference id="extensions.treestyletab.enableSubtreeIndent.horizontal"
 			name="extensions.treestyletab.enableSubtreeIndent.horizontal"
 			type="bool"/>
@@ -129,7 +135,11 @@
 				label="&config.allowSubtreeCollapseExpand;"/>
 			<checkbox id="extensions.treestyletab.enableSubtreeIndent.horizontal-check"
 				preference="extensions.treestyletab.enableSubtreeIndent.horizontal"
-				label="&config.enableSubtreeIndent;"/>
+				label="&config.enableSubtreeIndent;"
+				oncommand="
+					if (document.getElementById('extensions.treestyletab.tabbar.syncRelatedPrefsForDynamicPosition').value)
+						document.getElementById('extensions.treestyletab.tabbar.fixed.horizontal').value = !this.checked;
+				"/>
 			<checkbox id="extensions.treestyletab.enableSubtreeIndent.vertical-check"
 				preference="extensions.treestyletab.enableSubtreeIndent.vertical"
 				label="&config.enableSubtreeIndent;"/>
diff --git a/content/treestyletab/treestyletab.js b/content/treestyletab/treestyletab.js
index d20aea90..24161bf0 100644
--- a/content/treestyletab/treestyletab.js
+++ b/content/treestyletab/treestyletab.js
@@ -467,7 +467,7 @@ var TreeStyleTabService = {
 		var pref = isVertical ? 'tabbar.fixed.vertical' : 'tabbar.fixed.horizontal' ;
 		this.setTreePref(pref, !this.getTreePref(pref));
 
-		if (!this.getTreePref('syncRelatedPrefs')) return;
+		if (!this.getTreePref('tabbar.syncRelatedPrefsForDynamicPosition')) return;
 
 		if (!isVertical)
 			this.setTreePref('enableSubtreeIndent.horizontal', !this.getTreePref(pref));
diff --git a/content/treestyletab/treestyletabbrowser.js b/content/treestyletab/treestyletabbrowser.js
index 03f59e2f..3a87f09a 100644
--- a/content/treestyletab/treestyletabbrowser.js
+++ b/content/treestyletab/treestyletabbrowser.js
@@ -1208,12 +1208,15 @@ TreeStyleTabBrowser.prototype = {
 				break;
 
 			case 'extensions.treestyletab.enableSubtreeIndent.horizontal':
-			case 'extensions.treestyletab.enableSubtreeIndent.vertical':
 			case 'extensions.treestyletab.allowSubtreeCollapseExpand.horizontal':
+			case 'extensions.treestyletab.tabbar.fixed.horizontal':
+				if (!this.isVertical) this.updateTabbarState();
+				break;
+
+			case 'extensions.treestyletab.enableSubtreeIndent.vertical':
 			case 'extensions.treestyletab.allowSubtreeCollapseExpand.vertical':
 			case 'extensions.treestyletab.tabbar.fixed.vertical':
-			case 'extensions.treestyletab.tabbar.fixed.horizontal':
-				this.updateTabbarState();
+				if (this.isVertical) this.updateTabbarState();
 				break;
 
 			case 'extensions.treestyletab.tabbar.transparent.style':
diff --git a/defaults/preferences/treestyletab.js b/defaults/preferences/treestyletab.js
index 4588f8ae..3b2fbbcf 100644
--- a/defaults/preferences/treestyletab.js
+++ b/defaults/preferences/treestyletab.js
@@ -38,7 +38,7 @@ pref("extensions.treestyletab.tabbar.autoShow.keepShownOnMouseover", true);
 pref("extensions.treestyletab.tabbar.togglerSize", 5);
 pref("extensions.treestyletab.tabbar.fixed.horizontal", true);
 pref("extensions.treestyletab.tabbar.fixed.vertical", false);
-pref("extensions.treestyletab.syncRelatedPrefs", true);
+pref("extensions.treestyletab.tabbar.syncRelatedPrefsForDynamicPosition", true);
 pref("extensions.treestyletab.enableSubtreeIndent.horizontal", false);
 pref("extensions.treestyletab.enableSubtreeIndent.vertical",   true);
 pref("extensions.treestyletab.enableSubtreeIndent.allTabsPopup", true);