diff --git a/platform/Darwin/chrome.manifest b/platform/Darwin/chrome.manifest
index debb8ab4..e5596294 100644
--- a/platform/Darwin/chrome.manifest
+++ b/platform/Darwin/chrome.manifest
@@ -2,4 +2,4 @@ skin	treestyletab-platform	classic/1.0	jar:chrome/treestyletab.jar!/skin/classic
 style chrome://browser/content/browser.xul chrome://treestyletab-platform/skin/treestyletab-3.5.css appversion>=3.1b3pre
 
 skin	tabfx2compatible-platform	classic/1.0	jar:chrome/treestyletab.jar!/skin/classic/browser/
-style chrome://browser/content/browser.xul chrome://tabfx2compatible-platform/skin/browser.css
+style chrome://browser/content/browser.xul chrome://tabfx2compatible-platform/skin/browser.css	appversion>=3.4