diff --git a/defaults/preferences/treestyletab.js b/defaults/preferences/treestyletab.js
index 9c64e5cc..442691c2 100644
--- a/defaults/preferences/treestyletab.js
+++ b/defaults/preferences/treestyletab.js
@@ -121,7 +121,7 @@ pref("extensions.multipletab.show.multipletab-selection-item-removeTabSubTree",
 pref("extensions.multipletab.show.multipletab-selection-item-createSubTree", true);
 
 
-pref("extensions.treestyletab.compatibility.TMP", false); // Tab Mix Plus
+pref("extensions.treestyletab.compatibility.TMP", true); // Tab Mix Plus
 
 
 pref("extensions.treestyletab.prefsVersion", 0);