diff --git a/scratchpad-scripts/ghacks-clear-[removed].js b/scratchpad-scripts/ghacks-clear-[removed].js
index 1ad4ae9..6315ed0 100644
--- a/scratchpad-scripts/ghacks-clear-[removed].js
+++ b/scratchpad-scripts/ghacks-clear-[removed].js
@@ -1,7 +1,7 @@
 /***
  This will reset the preferences that have been removed completely from the ghacks user.js.
 
- Last updated: 18-Mov-2018
+ Last updated: 11-Dec-2018
 
  For instructions see:
  https://github.com/ghacksuserjs/ghacks-user.js/wiki/3.1-Resetting-Inactive-Prefs-[Scripts]
@@ -108,6 +108,7 @@
     'privacy.trackingprotection.ui.enabled',
     /* 64-beta */
     'browser.eme.ui.enabled',
+    'browser.sessionstore.max_windows_undo',
     /* reset parrot: check your open about:config after running the script */
     '_user.js.parrot'
   ]