diff --git a/content/treestyletab/treestyletab.js b/content/treestyletab/treestyletab.js
index 74a0ec97..1bb73734 100644
--- a/content/treestyletab/treestyletab.js
+++ b/content/treestyletab/treestyletab.js
@@ -257,6 +257,7 @@ var TreeStyleTabService = {
 				if (this.getTreePref('openGroupBookmarkAsTabSubTree') !== null) {
 					let behavior = 0;
 					if (this.getTreePref('openGroupBookmarkAsTabSubTree.underParent'))
+
 						behavior += this.kGROUP_BOOKMARK_USE_DUMMY;
 					if (!this.getTreePref('openGroupBookmarkBehavior.confirm')) {
 						behavior += (
@@ -1036,12 +1037,12 @@ catch(e) {
 			let source = this._getFunctionSource(aFunc);
 			if (!source || !/^\(?function handleLinkClick/.test(source))
 				return false;
-			eval(aFunc+' = '+source.replace(
+			eval(aFunc+' = '+source.replace( // for -Firefox 3.6
 				/(openNewTabWith\()/g,
 				<![CDATA[
 					if (!TreeStyleTabService.checkToOpenChildTab(event.target.ownerDocument.defaultView)) TreeStyleTabService.readyToOpenChildTab(event.target.ownerDocument.defaultView);
 					$1]]>
-			).replace(
+			).replace( // for -Firefox 3.6
 				/(event.ctrlKey|event.metaKey)/,
 				<![CDATA[
 					TreeStyleTabService.checkReadyToOpenNewTabFromLink({
@@ -1055,7 +1056,7 @@ catch(e) {
 						) :
 						(TreeStyleTabService.readyToOpenChildTab(), false)
 				]]>
-			).replace(
+			).replace( // for -Firefox 3.6
 				/* あらゆるリンクからタブを開く設定の時に、アクセルキーが押されていた場合は
 				   反転された動作（通常のリンク読み込み）を行う */
 				'return false;case 1:',
@@ -1082,11 +1083,38 @@ catch(e) {
 						return false;
 					case 1:
 				]]>
+			).replace( // for Firefox 4.0-
+				'where = whereToOpenLink(event);',
+				<![CDATA[$&
+					var TSTFilteringResult = TreeStyleTabService.filterWhereToOpenLink(where, { linkNode : linkNode, event : event });
+					where = TSTFilteringResult.where;
+					if (TSTFilteringResult.divertedToTab)
+						TreeStyleTabService.readyToOpenDivertedTab();
+				]]>.toString()
+			).replace( // for Firefox 4.0-
+				/(if \([^\)]*where == "current")/,
+				'$1 && !TSTFilteringResult.inverted'
+			).replace( // for Firefox 4.0-
+				/(fromContent\s*:\s*true\s*,)/,
+				'$1 event : event, linkNode : linkNode, '
 			));
 			source = null;
 			return true;
 		}, this);
 
+		// for Firefox 4.0-
+		if ('openLinkIn' in window) {
+			eval('window.openLinkIn = '+
+				window.openLinkIn.toSource().replace(
+					'browser.loadOneTab(',
+					<![CDATA[
+						if (!TreeStyleTabService.checkToOpenChildTab(params.linkNode.ownerDocument.defaultView))
+							TreeStyleTabService.readyToOpenChildTab(params.linkNode.ownerDocument.defaultView);
+						$&]]>.toString()
+				)
+			);
+		}
+
 		this._splitFunctionNames(<![CDATA[
 			window.permaTabs.utils.wrappedFunctions["window.contentAreaClick"]
 			window.__contentAreaClick
@@ -1477,6 +1505,7 @@ catch(e) {
 		if (!this.keyEventListeningFlags && this.keyEventListening) {
 			window.removeEventListener('keydown',  this, true);
 			window.removeEventListener('keyup',    this, true);
+
 			window.removeEventListener('keypress', this, true);
 			this.keyEventListening = false;
 		}
diff --git a/modules/utils.js b/modules/utils.js
index b9b89742..89fdeb48 100644
--- a/modules/utils.js
+++ b/modules/utils.js
@@ -1430,6 +1430,33 @@ var TreeStyleTabUtils = {
 		return this.checkReadyToOpenNewTab(options);
 	},
  
+	filterWhereToOpenLink : function TSTUtils_filterwhereToOpenLink(aWhere, aParams)
+	{
+		var inverted = false;
+		var divertedToTab = false;
+		var link = aParams.linkNode || aParams.event.originalTarget;
+		var isNewTab = this.isNewTabAction(aParams.event);
+		if (this.checkReadyToOpenNewTabFromLink({
+				link     : link,
+				modifier : isNewTab,
+				invert   : this.getTreePref('link.invertDefaultBehavior')
+			})) {
+			if (aWhere == 'current' && !isNewTab) {
+				divertedToTab = true;
+				aWhere = this.getPref('browser.tabs.loadInBackground') ? 'tabshifted' : 'tab' ;
+			}
+		}
+		else if (aWhere.indexOf('tab') > -1) {
+			aWhere = 'current';
+			inverted = true;
+		}
+		return {
+			where         : aWhere,
+			inverted      : inverted,
+			divertedToTab : divertedToTab
+		};
+	},
+ 
 	_getDomainFromURI : function TSTUtils__getDomainFromURI(aURI) 
 	{
 		if (!aURI) return null;