diff --git a/content/treestyletab/windowHelper.js b/content/treestyletab/windowHelper.js
index c72df480..5b56cf9e 100644
--- a/content/treestyletab/windowHelper.js
+++ b/content/treestyletab/windowHelper.js
@@ -187,11 +187,19 @@ var TreeStyleTabWindowHelper = {
 			'loadSearch' in BrowserSearch) {
 			eval('BrowserSearch.loadSearch = '+
 				BrowserSearch.loadSearch.toSource().replace(
+					// for old Firefox 3.6 or olders
 					'if (useNewTab) {',
 					<![CDATA[$&
 						if (TreeStyleTabService.shouldOpenSearchResultAsChild(arguments[0]))
 							TreeStyleTabService.readyToOpenChildTab();
 					]]>
+				).replace(
+					// for old Firefox 4 or later
+					'openLinkIn(',
+					<![CDATA[
+						if (useNewTab && TreeStyleTabService.shouldOpenSearchResultAsChild(arguments[0]))
+							TreeStyleTabService.readyToOpenChildTab();
+					$&]]>
 				)
 			);
 		}